Question 1

As an electron moves in the direction the electric field lines

Accepted Answer

The answer of As an electron moves in the direction...

Question 2

The power rating of a 400-Ω resistor is 0.25 W. What is the maximum voltage you can safely connect across its ends?

Accepted Answer

The answer of The power rating of a 400-Ω resistor...

Question 3

When 5.00 A is flowing through an 10.0-Ω device, how much power is being dissipated in the device?

Accepted Answer

The power dissipated in a device can be calculated using the formula P = I^2 * R, where P is power in watts, I is current in amperes, and R is resistance in ohms. Substituting the given values, P = (5.00 A)^2 * 10.0 Ω = 25 * 10.0 = 250 W.

Question 4

The electron-volt is a unit of

Accepted Answer

The electron-volt is a unit of energy, specifically the amount of kinetic energy gained or lost by an electron when it moves through an electric potential difference of one volt.

Question 5

A 150-W light bulb is designed to operate at 110 V dc. How much current does it draw?

Accepted Answer

The power (P) is given by the formula P = VI, where V is the voltage and I is the current. Rearranging for current, I = P/V. Substituting the given values, I = 150 W / 110 V = 1.36 A, which rounds to 1.4 A.

Question 6

The electric potential at a distance of 4 m from a certain point charge is 200 V relative to infinity. What is the potential (relative to infinity) at a distance of 2 m from the same charge?

Accepted Answer

The electric potential $V$ due to a point charge at a distance $r$ is given by $V = k \frac{Q}{r}$, where $k$ is Coulomb's constant and $Q$ is the charge. If the potential at 4 m is 200 V, then at 2 m (half the distance), the potential would be doubled (since $V$ is inversely proportional to $r$), making it 400 V.

Question 7

The potential (relative to infinity) at the midpoint of a square is 3.0 V when a point charge of +Q is located at one of the corners of the square. What is the potential (relative to infinity) at the center
When each of the other corners is also contains a point charge of

Accepted Answer

The answer of The potential (relative to infinity) at the...

Question 8

An electronic component with a  resistor is rated for use at power levels not exceeding 14 W. How much current can safely flow through the component?

Accepted Answer

The answer of An electronic component with a  resistor...

Question 9

If the result of your calculation of a quantity has SI units of kg ·

Accepted Answer

The answer of If the result of your calculation of...

Question 10

Two protons are released from rest, with only the electrostatic force acting. Which of the following statements must be true about them as they move apart? (There could be more than one correct
Choice.)

Accepted Answer

As the protons move apart, their electric potential energy decreases because they are moving to a position of lower potential energy. The decrease in potential energy is converted into kinetic energy, so their kinetic energy increases. The electrostatic force decreases with distance, leading to a decrease in acceleration.

Question 11

As a proton moves in a direction perpendicular to the electric field lines

Accepted Answer

When a proton moves perpendicular to the electric field lines, it is not moving along the potential gradient (from high to low potential or vice versa). Therefore, both its electric potential and electric potential energy remain constant, as it is not moving closer or farther from the source of the electric field in a way that would change its potential energy.

Question 12

A proton and an electron are released from rest, with only the electrostatic force acting. Which of the following statements must be true about them as they move toward each other? (There could
Be more than one correct choice.)

Accepted Answer

As a proton and an electron move toward each other due to the electrostatic force, their electric potential energy decreases because they are moving from a state of higher potential energy (when they are apart) to a state of lower potential energy (as they get closer). This decrease in electric potential energy is converted into kinetic energy, causing their kinetic energy to increase.

Question 13

As a proton moves in the direction the electric field lines

Accepted Answer

A proton moves from high potential to low potential along electric field lines, losing electric potential energy as it converts potential energy into kinetic energy.

Question 14

Two protons are fired toward each other in a particle accelerator, with only the electrostatic force acting. Which of the following statements must be true about them as they move closer together?
(There could be more than one correct choice.)

Accepted Answer

The answer of Two protons are fired toward each other...

Question 15

A 100-W resistance heater is connected to a 110-V dc source. What current flows through the heater?

Accepted Answer

The current can be calculated using Ohm's law, which states that current (I) equals power (P) divided by voltage (V). Thus, I = P/V = 100W / 110V = 0.91 A.

Question 16

If the electric potential at a point in space is zero, then the electric field at that point must be

Accepted Answer

The electric potential being zero at a point does not necessarily determine the magnitude or direction of the electric field at that point. The electric field could be non-zero, pointing in any direction, or zero, depending on the configuration of charges around the point.

Question 17

If the result of your calculation of a quantity has SI units kg ·

Accepted Answer

The answer of If the result of your calculation of...

Question 18

The nichrome heating element in an electric drier operates on 240 V and generates heat at the rate of 2.0 kW. The heating element shorts out and, in repairing it, the repairman shortens the
Nichrome wire by 10%. (Assume the temperature is unchanged. In reality, the resistivity of the
Wire will depend on its temperature.) What effect will the repair have on the power dissipated in
The heating element?

Accepted Answer

When the length of the wire is shortened by 10%, its resistance decreases by 10% (since resistance is directly proportional to length). With a constant voltage, the power dissipated (P = V^2/R) will increase because the resistance has decreased.

Question 19

A light bulb operating at a dc voltage of 120 V has a resistance of 200 Ω. How much power is dissipated in this bulb?

Accepted Answer

The answer of A light bulb operating at a dc...

Question 20

A resistance heater is rated at 1200 W when operating at 110 V dc. What current will it draw?

Accepted Answer

The power (P) is given by the formula P = V * I, where V is the voltage and I is the current. Rearranging for I gives I = P / V. Substituting the given values, I = 1200 W / 110 V = 10.909 A, which rounds to approximately 11 A.

Quiz 2: Describing Motion: Kinematics in One Dimension