Question 1

A negatively charged particle is moving to the right,directly above a wire having a current flowing to the right,as shown in the figure.In which direction is the magnetic force exerted on the particle?

Accepted Answer

D

Question 2

Three particles travel through a region of space where the magnetic field is out of the page,as shown in the figure.The electric charge of each of the three particles is,respectively,

Accepted Answer

E

Question 3

Two very long parallel wires in the xy-plane,a distance 2a apart,are parallel to the y-axis and carry equal currents I as shown in the figure.The +z direction points perpendicular to the xy-plane in a right-handed coordinate system.If both currents flow in the +y direction,which one of the graphs shown in the figure below best represents the z component of the net magnetic field,in the xy-plane,as a function of x? (Caution: These graphs are not magnetic field lines.)

Accepted Answer

According to the right-hand rule, the magnetic field due to the currents in each wire points in the +z direction above the wires and in the -z direction below the wires. Thus, at x = 0, the magnetic fields due to the two wires cancel out and the net magnetic field in the xy-plane is zero. As we move away from x = 0, the magnetic fields due to the two wires add up, resulting in a nonzero net magnetic field in the xy-plane. At large distances from the wires, the magnetic field due to each wire individually becomes negligible, and the net magnetic field approaches a constant value. Therefore, the graph that best represents the z component of the net magnetic field as a function of x is graph C.

Question 4

Two very long parallel wires are a distance d apart and carry equal currents in opposite directions.The locations where the net magnetic field due to these currents is equal to zero are

Accepted Answer

The answer of Two very long parallel wires are a...

Question 5

An electron moving in the direction of the +x-axis enters a magnetic field.If the electron experiences a magnetic deflection in the -y direction,the direction of the magnetic field in this region points in the direction of the

Accepted Answer

The direction of the magnetic force experienced by the electron is given by the right-hand rule. If the electron is moving in the +x direction and is deflected in the -y direction, then the magnetic field must be pointing in the -z direction. Thus, the correct choice is B.

Question 6

A horizontal wire carries a current straight toward you.From your point of view,the magnetic field at a point directly below the wire points

Accepted Answer

The answer of A horizontal wire carries a current straight...

Question 7

A charged particle is moving with speed v perpendicular to a uniform magnetic field.A second identical charged particle is moving with speed 2v perpendicular to the same magnetic field.If the frequency of revolution of the first particle is f,the frequency of revolution of the second particle is

Accepted Answer

The frequency of revolution for a charged particle in a magnetic field is independent of its speed, as it depends only on the charge, mass of the particle, and the magnetic field strength.

Question 8

Two long parallel wires placed side-by-side on a horizontal table carry identical size currents in opposite directions.The wire on your right carries current toward you,and the wire on your left carries current away from you.From your point of view,the magnetic field at the point exactly midway between the two wires

Accepted Answer

The answer of Two long parallel wires placed side-by-side on...

Question 9

Ions having equal charges but masses of M and 2M are accelerated through the same potential difference and then enter a uniform magnetic field perpendicular to their path.If the heavier ions follow a circular arc of radius R,what is the radius of the arc followed by the lighter?

Accepted Answer

The answer of Ions having equal charges but masses of...

Question 10

The figure shows three long,parallel,current-carrying wires.The current directions are indicated for currents I₁ and I₃.The arrow labeled F represents the net magnetic force acting on current I₃.The three currents have equal magnitudes.What is the direction of the current I₂?

Accepted Answer

The answer of The figure shows three long,parallel,current-carrying wires.The current...

Question 11

The figure shows three long,parallel current-carrying wires.The magnitudes of the currents are equal and their directions are indicated in the figure.Which of the arrows drawn near the wire carrying current 1 correctly indicates the direction of the magnetic force acting on that wire?

Accepted Answer

The answer of The figure shows three long,parallel current-carrying wires.The...

Question 12

Two very long parallel wires in the xy-plane,a distance 2a apart,are parallel to the y-axis and carry equal currents I as shown in the figure.The +z direction points perpendicular to the xy-plane in a right-handed coordinate system.If the left current flows in the +y direction and the right current flows in the -y direction,which one of the graphs shown in the figure below best represents the z component of the net magnetic field,in the xy-plane,as a function of x? (Caution: These graphs are not magnetic field lines.)

Accepted Answer

The answer of Two very long parallel wires in the...

Question 13

The figure shows two long wires carrying equal currents I₁ and I₂ flowing in opposite directions.Which of the arrows labeled A through D correctly represents the direction of the magnetic field due to the wires at a point located at an equal distance d from each wire?

Accepted Answer

The magnetic field due to each wire is perpendicular to the plane formed by the two wires, and is also perpendicular to the line connecting the point of interest with the wire. Thus, the magnetic field due to each wire at the point of interest will be into the plane of the figure for one wire and out of the plane of the figure for the other wire. The field vectors will be equal in magnitude and opposite in direction, so they will cancel out along the line connecting the wires. The only remaining component of the magnetic field will be perpendicular to the line connecting the wires, and will point in the direction shown by arrow B.

Question 14

A charge is accelerated from rest through a potential difference V and then enters a uniform magnetic field oriented perpendicular to its path.The field deflects the particle into a circular arc of radius R.If the accelerating potential is tripled to 3V,what will be the radius of the circular arc?

Accepted Answer

The answer of A charge is accelerated from rest through...

Question 15

A vertical wire carries a current vertically upward in a region where the magnetic field vector points toward the north.What is the direction of the magnetic force on this current due to the field?

Accepted Answer

The answer of A vertical wire carries a current vertically...

Question 16

The figure shows four different sets of insulated wires that cross each other at right angles without actually making electrical contact.The magnitude of the current is the same in all the wires,and the directions of current flow are as indicated.For which (if any)configuration will the magnetic field at the center of the square formed by the wires be equal to zero?

Accepted Answer

In configuration C, the magnetic fields produced by the wires in the top and bottom rows cancel each other out at the center point, and the magnetic fields produced by the wires in the left and right columns cancel each other out as well. Therefore, the total magnetic field at the center of the square is zero. In all other configurations, there will be a net magnetic field at the center point due to the wires.

Question 17

An electron,moving toward the west,enters a uniform magnetic field.Because of this field the electron curves upward.The direction of the magnetic field is

Accepted Answer

According to the Right Hand Rule, if the electron is curving upward and moving toward the west, then the magnetic field must be directed toward the north.

Question 18

A vertical wire carries a current straight down.To the east of this wire,the magnetic field points

Accepted Answer

The answer of A vertical wire carries a current straight...

Question 19

A long straight conductor has a constant current flowing to the right.A wire rectangle is situated above the wire,and also has a constant current flowing through it (as shown in the figure).Which of the following statements is true?

Accepted Answer

The answer of A long straight conductor has a constant...

Question 20

A ring with a clockwise current (as seen from above the ring)is situated with its center directly above another ring,which has a counter-clockwise current,as shown in the figure.In what direction is the net magnetic force exerted on the top ring?

Accepted Answer

The answer of A ring with a clockwise current (as...

Quiz 29: The Magnetic Field

A negatively charged particle is moving to the right,directly above a wire having a current flowing to the right,as shown in the figure.In which direction is the magnetic force exerted on the particle?

Three particles travel through a region of space where the magnetic field is out of the page,as shown in the figure.The electric charge of each of the three particles is,respectively,

Two very long parallel wires are a distance d apart and carry equal currents in opposite directions.The locations where the net magnetic field due to these currents is equal to zero are

An electron moving in the direction of the +x-axis enters a magnetic field.If the electron experiences a magnetic deflection in the -y direction,the direction of the magnetic field in this region points in the direction of the

A horizontal wire carries a current straight toward you.From your point of view,the magnetic field at a point directly below the wire points

A charged particle is moving with speed v perpendicular to a uniform magnetic field.A second identical charged particle is moving with speed 2v perpendicular to the same magnetic field.If the frequency of revolution of the first particle is f,the frequency of revolution of the second particle is

Ions having equal charges but masses of M and 2M are accelerated through the same potential difference and then enter a uniform magnetic field perpendicular to their path.If the heavier ions follow a circular arc of radius R,what is the radius of the arc followed by the lighter?

The figure shows three long,parallel,current-carrying wires.The current directions are indicated for currents I₁ and I₃.The arrow labeled F represents the net magnetic force acting on current I₃.The three currents have equal magnitudes.What is the direction of the current I₂?

The figure shows three long,parallel current-carrying wires.The magnitudes of the currents are equal and their directions are indicated in the figure.Which of the arrows drawn near the wire carrying current 1 correctly indicates the direction of the magnetic force acting on that wire?

The figure shows two long wires carrying equal currents I₁ and I₂ flowing in opposite directions.Which of the arrows labeled A through D correctly represents the direction of the magnetic field due to the wires at a point located at an equal distance d from each wire?

A charge is accelerated from rest through a potential difference V and then enters a uniform magnetic field oriented perpendicular to its path.The field deflects the particle into a circular arc of radius R.If the accelerating potential is tripled to 3V,what will be the radius of the circular arc?

A vertical wire carries a current vertically upward in a region where the magnetic field vector points toward the north.What is the direction of the magnetic force on this current due to the field?

An electron,moving toward the west,enters a uniform magnetic field.Because of this field the electron curves upward.The direction of the magnetic field is

A vertical wire carries a current straight down.To the east of this wire,the magnetic field points

A long straight conductor has a constant current flowing to the right.A wire rectangle is situated above the wire,and also has a constant current flowing through it (as shown in the figure) .Which of the following statements is true?

A ring with a clockwise current (as seen from above the ring) is situated with its center directly above another ring,which has a counter-clockwise current,as shown in the figure.In what direction is the net magnetic force exerted on the top ring?

Quiz 29: The Magnetic Field

A negatively charged particle is moving to the right,directly above a wire having a current flowing to the right,as shown in the figure.In which direction is the magnetic force exerted on the particle?

Three particles travel through a region of space where the magnetic field is out of the page,as shown in the figure.The electric charge of each of the three particles is,respectively,

Two very long parallel wires are a distance d apart and carry equal currents in opposite directions.The locations where the net magnetic field due to these currents is equal to zero are

An electron moving in the direction of the +x-axis enters a magnetic field.If the electron experiences a magnetic deflection in the -y direction,the direction of the magnetic field in this region points in the direction of the

A horizontal wire carries a current straight toward you.From your point of view,the magnetic field at a point directly below the wire points

A charged particle is moving with speed v perpendicular to a uniform magnetic field.A second identical charged particle is moving with speed 2v perpendicular to the same magnetic field.If the frequency of revolution of the first particle is f,the frequency of revolution of the second particle is

Ions having equal charges but masses of M and 2M are accelerated through the same potential difference and then enter a uniform magnetic field perpendicular to their path.If the heavier ions follow a circular arc of radius R,what is the radius of the arc followed by the lighter?

The figure shows three long,parallel,current-carrying wires.The current directions are indicated for currents I1 and I3.The arrow labeled F represents the net magnetic force acting on current I3.The three currents have equal magnitudes.What is the direction of the current I2?

The figure shows three long,parallel current-carrying wires.The magnitudes of the currents are equal and their directions are indicated in the figure.Which of the arrows drawn near the wire carrying current 1 correctly indicates the direction of the magnetic force acting on that wire?

The figure shows two long wires carrying equal currents I1 and I2 flowing in opposite directions.Which of the arrows labeled A through D correctly represents the direction of the magnetic field due to the wires at a point located at an equal distance d from each wire?

A charge is accelerated from rest through a potential difference V and then enters a uniform magnetic field oriented perpendicular to its path.The field deflects the particle into a circular arc of radius R.If the accelerating potential is tripled to 3V,what will be the radius of the circular arc?

A vertical wire carries a current vertically upward in a region where the magnetic field vector points toward the north.What is the direction of the magnetic force on this current due to the field?

An electron,moving toward the west,enters a uniform magnetic field.Because of this field the electron curves upward.The direction of the magnetic field is

A vertical wire carries a current straight down.To the east of this wire,the magnetic field points

A long straight conductor has a constant current flowing to the right.A wire rectangle is situated above the wire,and also has a constant current flowing through it (as shown in the figure) .Which of the following statements is true?

A ring with a clockwise current (as seen from above the ring) is situated with its center directly above another ring,which has a counter-clockwise current,as shown in the figure.In what direction is the net magnetic force exerted on the top ring?

The figure shows three long,parallel,current-carrying wires.The current directions are indicated for currents I₁ and I₃.The arrow labeled F represents the net magnetic force acting on current I₃.The three currents have equal magnitudes.What is the direction of the current I₂?

The figure shows two long wires carrying equal currents I₁ and I₂ flowing in opposite directions.Which of the arrows labeled A through D correctly represents the direction of the magnetic field due to the wires at a point located at an equal distance d from each wire?