NSAA NSAA Physics - Electricity and Magnetism 2

Question 1

A 10 Ω resistor carries 2 A of current. What power is dissipated?

Accepted Answer

40 W

Answer

Power P = I²R = 4 × 10 = 40 W.

Question 2

A capacitor stores 0.01 C of charge at a potential difference of 5 V. What is its capacitance?

Accepted Answer

0.002 F

Answer

Capacitance C = Q/V = 0.01/5 = 0.002 F.

Question 3

Which of the following best describes the direction of conventional current in a circuit?

Accepted Answer

From positive to negative terminal

Answer

By convention, current flows from the positive terminal of the source, through the circuit, to the negative terminal.

Question 4

A solenoid with 200 turns carries a current. Doubling the number of turns while keeping current constant will have what effect on the magnetic field inside?

Accepted Answer

Double it

Answer

The magnetic field inside a solenoid is B = μ₀nI, proportional to the number of turns per unit length, so doubling turns doubles B.

Question 5

A wire of length 0.5 m carrying 4 A is placed perpendicular to a magnetic field of 0.3 T. What force acts on it?

Accepted Answer

0.6 N

Answer

F = BIL = 0.3 × 4 × 0.5 = 0.6 N.

NSAA - Natural Sciences Admissions Assessment Practice Test

NSAA - Natural Sciences Admissions Assessment Practice Test

NSAA NSAA Physics - Electricity and Magnetism 2