Magnets and Magnetic Fields - Jamb Physics Past Questions and Answers

Question 31:

• JAMB 1995

At different locations on the earth's surface, the earth's magnetic field is

A. The same in magnitude and direction
B. The same in magnitude but different in direction
C. Different in both magnitude and direction
D. Different in magnitude but different in direction

Question 32:

• JAMB 1999

Steel is more suitable for permanent magnet than iron because the former

A. Is easily demagnetized by shaing vigorously
B. Is an alloy of many metals
C. Is easily magnetized by alternating current through one cycle
D. Retains magnetism more than iron

Question 33:

• JAMB 1999

The diagram above shows a magnet X with its south pole moved along a soft - iron bar PQ in the direction shown. After some time, the poles at P and Q respectively are

A. North - North
B. North - South
C. South - North
D. South - South

Question 34:

• JAMB 2000

A conductor of length 2m carries a current of 0.8A while kept in a magnetic field of magnetic flux density 0.5T. The maximum force acting on it is

A. 0.2N
B. 0.8N
C. 3.2N
D. 8.0N

Question 35:

• JAMB 2000

If current flows in the direction of the arrows in the solenoid above, the north pole is at

A. P
B. Y
C. X
D. Q