Magnets and Magnetic Fields - Jamb Physics Past Questions and Answers

Question 26:

• JAMB 1992

The angle between the direction of the earth's magnetic field and the horizontal is called the

A. Angle of deviation
B. Magnetic declination
C. Magnetic meridian
D. Angle of dip

Question 27:

• JAMB 1992

The diagram above represents the field pattern obtained by bringing the poles of two magnets together.The poles must be

A. S-S poles
B. S-N poles
C. N-S poles
D. N-N poles

Question 28:

• JAMB 1993

Which of the following correctly explains why soft iron is proffered to steel in electromagnets? i. soft iron is more readily magnetized than steel. ii. soft iron is more readily demagnetized than steel. iii. soft iron retains magnetism more than steel.

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

Question 29:

• JAMB 1993

A current carrying conductor experiences a force when placed in a magnetic field because the

A. Conductor is magnetized
B. Magnetic field of the current interacts with external magnetic field
C. Force is due to the motor principle
D. Electric field of the current interacts with the external magnetic field

Question 30:

• JAMB 1994

Which of the following are found in the receiver but not in the microphone of a telephone handset? i. Diaphragm. ii. soft iron pole pieces. iii. permanent magnet. iv.carbon blocks

A. I and ii
B. I and iv
C. Ii and iii
D. Iii and iv