NSAA NSAA Physics - Electricity and Magnetism 3

Question 1

What is the energy stored in a capacitor of capacitance 4 F charged to 3 V?

Accepted Answer

18 J

Answer

6 J

Answer

12 J

Answer

36 J

Question 2

In a step-up transformer, the primary coil has 100 turns and the secondary has 500 turns. If the primary voltage is 20 V, what is the secondary voltage?

Accepted Answer

100 V

Answer

4 V

Answer

20 V

Answer

200 V

Question 3

A positive charge is released from rest between two parallel plates with the positive plate on the left. In which direction will it accelerate?

Accepted Answer

To the right (toward negative plate)

Answer

To the left (toward positive plate)

Answer

Upward

Answer

It will not move

Question 4

Two point charges of +2 C and +8 C are 3 m apart. The electric force between them is F. If the distance is halved to 1.5 m, the new force is:

Accepted Answer

4F

Answer

F/4

Answer

F/2

Answer

2F

Question 5

An electron moves with velocity v perpendicular to a magnetic field B. What is the shape of its path?

Accepted Answer

Circle

Answer

Straight line

Answer

Parabola

Answer

Ellipse

Question 6

A circuit has an EMF of 9 V and internal resistance of 1 Ω connected to an external resistor of 8 Ω. What is the terminal voltage?

Accepted Answer

8 V

Answer

1 V

Answer

9 V

Answer

10 V