Electrostatics - Jamb Physics Past Questions and Answers

Question 51:

• JAMB 2011

A perfect emitter or absorber of radiant energy is a

A. Conductor
B. Black body
C. White body
D. Red body

Question 52:

• JAMB 2011

Two inductors of inductance 4 II and 8 II are arrange in series and a current of 10 A is passed through them. What is the energy stored in them?

A. 600 J
B. 50 J
C. 133 J
D. 250 J

Question 53:

• JAMB 2011

Which of the following will be applied when a metal Y is used to electroplate another metal X in electrolysis?

A. X is the anode and very high current is used
B. X is the anode and Y is the cathode
C. Y is the cathode and X is the anode
D. Y is the anode and very high current is used

Question 54:

• JAMB 2011

The correct expression for the potential at a point distance r from a charge q in an electric field is

A. _q²

4πεor2

B. _q²

4πεor

C. _q

4πεor2

D. _q

4πεor

Question 55:

• JAMB 2012

An electron of charge 1.6 x 10^-19C and mass 9.1 x 10^-31kg is accelerated between two metal plates with a velocity of 4 x 10⁷ms^-1, the potential difference between the plates is

A. 4.55 x 10³V
B. 4.55 x 10²V
C. 9.10 x 10¹V
D. 4.55 x 10¹V