Capacitors - Jamb Physics Past Questions and Answers

Question 11:

• JAMB 1992

A capacitor of 10µF is connected across a cell of 12 volts as shown above, calculate the energy stored in the capacitor

A. 7.2 x 10^-4J
B. 1.4 x 10^-3J
C. 1.4 x 10^-3J
D. 1.2 x 10^-2J

Question 12:

• JAMB 1993

A parallel plate capacitor of area 10cm² in vacuum has a capacitance of 10^-2\(\mu\)F. What is the distance between the plates?(e[sub][/sub] = 9 x 10^-12fm)

A. 9 x 10^-13m
B. 9 x 10^-7m
C. 9 x 10^-3m
D. 9 x 10⁷m

Question 13:

• JAMB 1994

A capacitor 8\(\mu\)F is charged to a potential difference of 100V. The energy stored by the capacitor is

A. 1.0 x 10⁴J
B. 8.0 x 10J
C. 1.25 x 10J
D. 4.0 x 10^-2J

Question 14:

• JAMB 1995

The purpose of a dielectric material in a parallel plate capacitor is to

A. Increase its capacitance
B. Decrease its capacitance
C. Insulate the plate from each other
D. Increase the magnetic field between the plates

Question 15:

• JAMB 1997

If 8 x 10\(^{-2}\) J of work is required to move 100\(\mu\)C of charge from a point X to a point Y in an electrical circuit, the potential difference between X and Y is

A. 4.0 x 10² v
B. 4.0 x 10⁴ v
C. 8.0 x 10² v
D. 8.0 x 10^-2 v