Electrostatics - Jamb Physics Past Questions and Answers

Question 21:

• JAMB 1992

Calculate the force acting on an electron of charge 1.6 x 10^-19C placed in an electric field of intensity 10⁸Vm^-1

A. 1.6 x 10^-11N
B. 1.6 x 10^-14N
C. 1.6 x 10^-16N
D. 1.0 x 10^-16N

Question 22:

• JAMB 1992

When an ebolite rod is rubbed with fur, it has

A. No charge at all
B. A negative charge
C. A positive charge
D. Negative and positive charges

Question 23:

• JAMB 1994

When a biro pen rubbed on a dry silk cloth is moved very close to a piece of paper on a dry table, the pen is found to pick up the paper. This is because

A. Both the pen and the cloth are magnetized
B. The pen is magnetized but the cloth is not
C. The pen is charged while the cloth is magnetized
D. Both the pen and the cloth are charged

Question 24:

• JAMB 1995

Two parallel plates at a distance of 8.0 x 10^-3m apart are maintained at a p.d of 600 volts with the negative plate earthed. What is the electric field strength?

A. 4.8 Vm^-1
B. 75.0Vm^-1
C. 4800.0Vm^-1
D. 75000.0Vm^-1

Question 25:

• JAMB 1998

The force of repulsion between two point positive charges 5\(\mu\)C and 8\(\mu\)C separated at a distance of 0.02 map art is. [\(\frac{1}{4{\pi}{\varepsilon}_o}\) = 9 x 10⁹Nm²C^-2]

A. 1.8 x 10^-10N
B. 9.0 x 10^-8N
C. 9.0 x 10²N
D. 4.5 x 10³N