The induction coil - Jamb Physics Past Questions and Answers

Question 1:

• JAMB 2019

If the time of flight is 96seconds, calculate the horizontal range through the point of projection.

A. 84400m
B. 69000m
C. 61440m
D. 24000m

Question 2:

• JAMB 1980

The best material for the core of the primary and secondary coils of an induction coil is

A. Copper, because it has a good conductor of electricity
B. Steel, because it becomes magnetic and retains its magnetism for a long time
C. Rubber, because it is a good insulator and the user is prevented from shock
D. Soft iron, because it becomes magnetic but easily loses its magnetism
E. Glass, because it is transparent

Question 3:

• JAMB 1981

A transformer has 300 turns of wire in the primary coil and 30 turns in the secondary coil.If the input voltage is 100 volts, the output voltage is

A. 5 volts
B. 10 volts
C. 15 volts
D. 20 volts
E. 25 volts

Question 4:

• JAMB 1981

A closed coil of wire is placed near a magnet. The magnet lies along the axis of the coil. Under which of the following conditions would there be no current in the coil?

A. When the coil is moved toward the stationary magnet
B. When the coil is moved away from the stationary magnet
C. When the coil is held stationary but the magnet is moved towards the coil
D. When both the coil and the magnet are held stationary
E. When the coil is held stationary but the magnet is moved away from the cell

Question 5:

• JAMB 1985

On which of the following does the operation of a moving coil ammeter depend? i. Electromagnetic induction ii. Force on a carrying-current conductor iii. Magnetic effect of an electric current

A. I only
B. Ii only
C. Iii only
D. Ii and iii only
E. I,ii and iii