Question 1

Two lamps, one with a thick filament and one with a thin filament, are connected in parallel to a battery. The voltage is greatest across the lamp with the
A) thick filament.
B) thin filament.
C) Both voltages are the same.

Accepted Answer

In a parallel circuit, all components share the same voltage, regardless of their individual characteristics such as filament thickness.

Question 2

Two charged particles repel each other with a force F. If the charge of one of the particles is doubled and the distance between them is also doubled, then the force will be
A) F.
B) 2 F.
C) F/4.
D) F/2.
E) none of these

Accepted Answer

The force between two charges is given by Coulomb's law: F = k * (q1 * q2) / r^2. If one charge is doubled (2q1) and the distance is doubled (2r), the new force F' = k * (2q1 * q2) / (2r)^2 = (1/2) * F.

Question 3

A capacitor is used to store
A) both charge and energy.
B) energy.
C) charge.
D) neither charge or energy.

Accepted Answer

Capacitors are designed to store both charge and energy. When a capacitor is charged, it holds onto charge on its plates, and this accumulation of charge leads to the storage of energy in the electric field between these plates.

Question 4

A woman experiences an electrical shock. The electrons making the shock come from the
A) electric field in the air.
B) power plant.
C) hairdryer.
D) woman's body.
E) ground.

Accepted Answer

The answer of A woman experiences an electrical shock. The...

Question 5

The unit of electric charge, the coulomb, is the charge on
A) a specific number of neutrons.
B) a neutron.
C) a quark.
D) a specific large number of electrons.
E) one electron.

Accepted Answer

The coulomb is defined as the charge transported by a constant current of one ampere in one second. This equates to the charge of approximately 6.242 x 10^18 electrons, which is a specific large number of electrons.

Question 6

An electron is pushed into an electric field where it acquires a 1-V electrical potential. If two electrons are pushed the same distance into the same electric field, the electrical potential of the two
Electrons is
A) 0.5 V.
B) 0.25 V.
C) 1 V.
D) 2 V.
E) 4 V.

Accepted Answer

The electrical potential (voltage) at a point in an electric field is independent of the charge placed at that point. Therefore, whether there is one electron or two, the electrical potential they experience at the same location in the electric field remains 1 V.

Question 7

The primary source of electrons in an ordinary electrical circuit is
A) the power station generator.
B) a dry cell, wet cell or battery.
C) the electrical circuit itself.
D) the back emf of motors.
E) none of these

Accepted Answer

The primary source of electrons in an ordinary electrical circuit is the electrical circuit itself, as the electrons are already present in the conductive materials (such as metals) that make up the circuit. They are not supplied from an external source but are moved through the circuit by the electric field created by the voltage source.

Question 8

An electron and a proton
A) attract each other.
B) repel each other.
C) neither attract or repel each other.

Accepted Answer

Electrons and protons attract each other due to their opposite electric charges; electrons have a negative charge, while protons have a positive charge.

Question 9

When a single charge q is placed at one corner of a square, the electric field at the center of the square is F/q. If two other equal charges are placed at the adjacent corners of the square, the electric
Field at the center of the square due to these three equal charges is
A) F/(2q).
B) 4F/q.
C) F/q.
D) F/(4q).
E) None of the above choices are correct.

Accepted Answer

The electric field at the center of the square due to a single charge q is F/q. When two other equal charges are placed at the adjacent corners of the square, the electric field at the center of the square due to these three equal charges is the vector sum of the electric fields due to each individual charge. The electric field due to the two charges at the adjacent corners is F/q in the same direction as the electric field due to the charge at the first corner. Therefore, the total electric field at the center of the square is 3F/q.

Question 10

A transistor is an example of a
A) resistor.
B) semiconductor.
C) superconductor.
D) transmitter.
E) dry cell.

Accepted Answer

Transistors are made from semiconductor materials, typically silicon, which allow them to control the flow of electrical current in a circuit. They are not resistors, superconductors, transmitters, or dry cells.

Question 11

A circuit is powered with a battery. Charge flows
A) through both the battery and the rest of the circuit.
B) from the negative battery terminal to the positive terminal.
C) out of the battery and into the circuit.
D) only after a couple seconds pass.
E) none of these

Accepted Answer

Charge flows through both the battery and the rest of the circuit because the battery provides the energy to push the charge through the circuit.

Question 12

As more lamps are put into a parallel circuit, the overall current in the power source
A) increases.
B) stays the same.
C) decreases.

Accepted Answer

When lamps are added to a parallel circuit, each lamp provides an additional pathway for current to flow, reducing the overall resistance of the circuit. According to Ohm's Law, if resistance decreases and voltage remains constant, the current must increase.

Question 13

Heat a copper wire and its electric resistance
A) decreases.
B) increases.
C) remains unchanged.

Accepted Answer

The electric resistance of a copper wire increases when it is heated. This is because heating the wire causes the atoms in the copper to vibrate more, which makes it harder for the electrons to flow through the wire, thus increasing its resistance.

Question 14

A main difference between gravitational and electric forces is that electrical forces
A) act over shorter distances.
B) obey the inverse-square law.
C) repel or attract.
D) attract.
E) are weaker.

Accepted Answer

Gravitational forces always attract, while electric forces can either repel or attract depending on the charges involved (like charges repel, opposite charges attract).

Question 15

Superconductors are noted for their
A) bright colors.
B) absence of electric resistance.
C) low cost.
D) high electric resistance.
E) low electric resistance.

Accepted Answer

Superconductors are materials that can conduct electricity without any resistance when they are cooled below a certain critical temperature.

Question 16

The electric field inside the dome of a Van de Graaff generator
A) depends on the volume of the dome
B) depends on the amount of charge the outside of dome.
C) Choices A and B are both correct.
D) None of the above choices are correct..

Accepted Answer

The answer of The electric field inside the dome of...

Question 17

Alternating current is normally produced by a
A) battery.
B) generator.
C) both of these
D) neither of these

Accepted Answer

Alternating current is produced by a generator. A battery produces direct current.

Question 18

A sphere has a negative charge of 6.4 × 10-7 coulomb. The approximate number of electrons that must be removed to make the sphere neutral is
A) 1.6 × 10-8.
B) 6.4 × 1026 .
C) 9.8 × 103.
D) 4.0 × 1012 .

Accepted Answer

The charge of one electron is approximately 1.6 × 10^-19 coulombs. To find the number of electrons, divide the total charge by the charge of one electron: (6.4 × 10^-7) / (1.6 × 10^-19) = 4.0 × 10^12.

Question 19

In an electric circuit, the safety fuse is connected to the circuit in
A) series.
B) parallel.
C) either series or parallel.

Accepted Answer

The safety fuse is always connected in series with the circuit it is meant to protect. This is because in a series circuit, the same current flows through all the components. Placing the safety fuse in series allows it to break the circuit if the current exceeds a safe level, protecting the rest of the circuit components. If the fuse were connected in parallel, the current would bypass it and it would not serve its purpose of protecting the circuit.

Question 20

Compared to the amount of electric current in the filament of a lamp, the amount of current in the connecting wire is
A) actually more.
B) the same.
C) often less.
D) definitely less.
E) incredibly, all of these.

Accepted Answer

The amount of electric current in the filament of a lamp is the same as the amount of current in the connecting wire because electric current is conserved in a closed circuit.

Quiz 10: Static and Current Electricity

Two lamps, one with a thick filament and one with a thin filament, are connected in parallel to a battery. The voltage is greatest across the lamp with the

Two charged particles repel each other with a force F. If the charge of one of the particles is doubled and the distance between them is also doubled, then the force will be

A capacitor is used to store

A woman experiences an electrical shock. The electrons making the shock come from the

The unit of electric charge, the coulomb, is the charge on

An electron is pushed into an electric field where it acquires a 1-V electrical potential. If two electrons are pushed the same distance into the same electric field, the electrical potential of the two Electrons is

The primary source of electrons in an ordinary electrical circuit is

An electron and a proton

When a single charge q is placed at one corner of a square, the electric field at the center of the square is F/q. If two other equal charges are placed at the adjacent corners of the square, the electric Field at the center of the square due to these three equal charges is

A transistor is an example of a

A circuit is powered with a battery. Charge flows

As more lamps are put into a parallel circuit, the overall current in the power source

Heat a copper wire and its electric resistance

A main difference between gravitational and electric forces is that electrical forces

Superconductors are noted for their

The electric field inside the dome of a Van de Graaff generator

Alternating current is normally produced by a

A sphere has a negative charge of 6.4 × 10-7 coulomb. The approximate number of electrons that must be removed to make the sphere neutral is

In an electric circuit, the safety fuse is connected to the circuit in

Compared to the amount of electric current in the filament of a lamp, the amount of current in the connecting wire is