Electrostatics - Jamb Physics Past Questions and Answers

Question 26:

• JAMB 1998

An ebonite rod rubbed with fur attracts a glass rod rubbed with silk because

A. Ebonite has a negative charge while glass has a positive charge
B. Ebonite has a positive charge while glass has a negative charge
C. Both have negative charges
D. Both have positive charges

Question 27:

• JAMB 1998

Find the work done in moving a 2 C charge between two points X and Y in an electric field if the potential difference is 100 volts

A. 50J
B. 100J
C. 200J
D. 400J

Question 28:

• JAMB 2000

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

Question 29:

• JAMB 2001

A student is at a height 4m above the ground during a thunderstorm. Give that the potential difference between the thundercloud and the ground is 10⁷v, the electric field created by the storm is

A. 2.0 * 10⁶ NC ^-1
B. 2. 5 * 10⁶ NC ^-1
C. 1.0 * 10⁷ NC ^-1
D. 4.0 * 10⁷ NC ^-1

Question 30:

• JAMB 2001

the ratio of electrostatic force F_E to gravitational force F_G between two protons each of charge e and mass m, at a distance d is

A. E/4πԐoGm
B. E²/Gm²
C. Gm²/4πԐoe²
D. E²/4πԐoeGm²