Magnets and Magnetic Fields - Jamb Physics Past Questions and Answers

Question 51:

• JAMB 2012

The force on a current carrying conductor in a magnetic field is greatest when the

A. Conductor makes an angle of 60° with the field
B. Force is idependent of the angles between the fields and the conductor
C. Conductor is parallel with the field
D. Conductor is at right angle with the field

Question 52:

• JAMB 2012

The magnetic force on a charged particle moving with velocity v is

A. Proportional to both the magnitude of the charge and the velocity v
B. Independent of the magnitude of the charge
C. Proportional to the velocity v only
D. Proportional to the magnitude of the charge only

Question 53:

• JAMB 2014

What is the best method of demagnetizing a steel bar magnet?

A. Hammering
B. Heating it
C. Rough handling it
D. Solenoid method

Question 54:

• JAMB 2014

The magnitude of the angle of dip at the equator is

A. 360^o
B. 0^o
C. 90^o
D. 180^o

Question 55:

• JAMB 2015

Lodestone is a natural magnet, it points at

A. N – W when suspended freely
B. N–S when suspended freely
C. S – E when suspended freely
D. S–W when suspended freely