Magnets and Magnetic Fields - 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 1979

Which of the following statements is correct? The magnetized state of an iron bar can be destroyed completely by

A. Heating the bar to a high temperature
B. Breaking the bar
C. Connecting opposite poles with a small piece of iron
D. Placing the bar inside a strong magnetic field
E. None of the above

Question 3:

• JAMB 1979

Fig 8 shows a current I flowing in a copper wire situated in a magnetic field existing between the pole-pieces of a horse-shoe magnet.
Which of the following statements is correct?

A. The wire will experience a force in the direction into the paper
B. The wire will experience a force in the direction out of the paper
C. The wire will vibrate in a direction into and out of the paper
D. The wire will move in the direction of the field i.e toward the s-pole
E. The wire will not move because it is made of copper which is non magnetic

Question 4:

• JAMB 1980

A magnet is similar to a bipolar charged system in that

A. It consists of two opposite poles - the north and south poles
B. The earth's magnetic field has a south pole near the geographical north pole and a north pole near the geographical south pole
C. The force of attraction and repulsion between opposite and between like poles obeys a law for electrostatic charges
D. A and B only
E. A and C only

Question 5:

• JAMB 1980

The name given to the characteristics behaviour of substances which set their length perpendicular to a strong magnetic field instead of in line with it is

A. Magnetization
B. Paramagnetism
C. Diamagnetism
D. Demagnetization
E. Ferromagnetism