Physics Past Questions and Answers

The magnitude of the gravitational force between two particles 0.10m apart is 10N. If the distance between them is increased to 0.20m, calculate the magnitude of the new force

A 40.0N
B 20.0N
C 5.0N
D 2.5N

Question 3007:

As the plates of a charged variable capacitor are moved closer together, the potential difference between them

A Increased
B Decrease
C Remains the same
D Is doubled

Question 3008:

What is the effective capacitance in the circuit?

A 2\(\mu F\)
B 6\(\mu F\)
C 18\(\mu F\)
D 216\(\mu F\)

Question 3009:

What is the total energy stored by the capacitors?

A 2.0 x 10^-4J
B 1.0 x 10^-4J
C 9.0 x 10^-2J
D 1.0 x 10^-2J

Question 3010:

Three identical lamps each power 100W are connected in parallel across a potential difference of 250V. Calculate the current in the circuit

A 7.5A
B 2.5A
C 1.2A
D 0.8A