Question

1. The direct current flowing through a coil of a wire in increased. What will happen to the magnetic force produced in the coil?

a. it will increase

b. it will decrease

c. it remains unchanged

d. the north pole will switch places with the south pole

2. A copper wire remains stationary within a magnetic field. What can be said about the force applied to the wire?

a. it will tend to force the wire away from the field

b. it will draw the wire towards the field

c. it will induce a current to flow in the wire

d. there will be no force on the wire from the magnetic field

3. How can the poles of an electro magnet (solenoid) be changed?

a. increase the number of coils

b. decrease the number of coils

c. reverse the direction of the current

d. increase the magnitude of the current

Answer 1