Capacitors - Jamb Physics Past Questions and Answers

Question 26:

• JAMB 2006

If the capacitance of an capacitor is C = (εA)/d, which of the following parameters is varied when a variable capacitors is used for tuning radio sets?

A. Constant (ε) and area
B. Area and distance.
C. Constant (ε) only
D. Distance only

Question 27:

• JAMB 2010

Three capacitors of capacitance 2μF, 4μFand 8μF are connected in parallel and a P.D of 6V is maintained across each capacitor, the total energy stored is

A. 2.52 x 10^-6J
B. 6.90 x 10^-6J
C. 2.52 x 10^-4J
D. 6.90 x 10^-4J

Question 28:

• JAMB 2011

The capacitance of a parallel plate capacitor is 20 μf in air and 60 μf in the presence of a dielectric. What is the dielectric constant?

A. 0.3
B. 6.0
C. 3.0
D. 2.0

Question 29:

• JAMB 2012

when a piece of rectangular glass block is inserted between two parallel capacitor,at constant plate area and distance of separation, the capacitance of the capacitor will

A. Increase
B. Decrease
C. Decrease then increase
D. Remain constant

Question 30:

• JAMB 2013

Capacitors are used in the induction coil to

A. Control circuits
B. Prevent distortion of electric fields
C. Prevent electric sparks
D. Dissipate energy