Physics Electricity and Magnetism 2

Question 1

Two parallel plates are separated by 0.01 m with a voltage of 100 V across them. What is the electric field strength between the plates?

Accepted Answer

10,000 V/m

Answer

1,000 V/m

Answer

100 V/m

Answer

0.1 V/m

Question 2

A magnetic field exerts no force on a charged particle when the particle moves:

Accepted Answer

Parallel to the field

Answer

Perpendicular to the field

Answer

At 45° to the field

Answer

Opposite to the field direction

Question 3

Which law relates the line integral of the magnetic field around a closed loop to the current enclosed by that loop?

Accepted Answer

Ampere's Law

Answer

Faraday's Law

Answer

Gauss's Law

Answer

Biot-Savart Law

Question 4

A capacitor fully charged to 12 V is connected to a resistor. After one time constant τ, the voltage across the capacitor is approximately:

Accepted Answer

4.4 V

Answer

0 V

Answer

7.6 V

Answer

12 V

Question 5

The energy stored in an inductor carrying current I with inductance L is:

Accepted Answer

½LI²

Answer

LI

Answer

LI²

Answer

½L²I

Question 6

What happens to the capacitance of a parallel-plate capacitor if the plate area is doubled while the separation is also doubled?

Accepted Answer

Capacitance stays the same

Answer

Capacitance doubles

Answer

Capacitance halves

Answer

Capacitance quadruples

Question 7

In an AC circuit, the impedance of a pure capacitor with capacitance C at angular frequency ω is:

Accepted Answer

1/(ωC)

Answer

ωC

Answer

ωL

Answer

R