Physics Electricity and Magnetism

Question 1

A 12 V battery is connected to a resistor with a resistance of 4 ohms. What is the current flowing through the circuit?

Accepted Answer

3 A

Answer

2 A

Answer

4 A

Answer

6 A

Question 2

If the current in a wire doubles, how does the magnetic field around the wire change?

Accepted Answer

It doubles.

Answer

It remains the same.

Answer

It quadruples.

Answer

It halves.

Question 3

Two charges  +2𝜇𝐶 and −3𝜇C are 0.1 m apart. What is the magnitude of the electrostatic force between them? (Use 𝑘=9×10'9 N\cdotpm'2/C2).

Accepted Answer

3.6 N

Answer

5.4 N

Answer

6.0 N

Answer

9.0 N

Question 4

Which of the following is true about a series circuit?

Accepted Answer

The total resistance is the sum of all individual resistances.

Answer

The total resistance is less than the smallest individual resistor.

Answer

The current is different through each resistor.

Answer

The voltage across each resistor is the same.

Question 5

A coil of wire is moved through a magnetic field, inducing a voltage. Which factor will NOT affect the magnitude of the induced voltage?

Accepted Answer

The resistance of the wire in the coil.

Answer

The speed of motion of the coil.

Answer

The strength of the magnetic field.

Answer

The number of turns in the coil.