Question
A current-carrying coil is placed in a magnetic field.
Which effect does the coil experience?
A a change in shape
B a change in weight
C a resultant force
D a turning effect
Answer/Explanation
Ans: D
Question
A current-carrying conductor is placed between two magnetic poles. The current causes a force to act on the wire.
Three other arrangements P, Q and R, of the wire and magnetic poles are set up as shown.
Which arrangements will cause a force in the opposite direction to that shown in the top diagram?
A P, Q and R
B P and Q only
C P only
D R only
Answer/Explanation
Ans: B
Question
A wire is placed between the poles of a horseshoe magnet. There is a current in the wire in the
direction shown, and this causes a force to act on the wire.
Three other arrangements P, Q and R of the wire and magnet are set up as shown.
Which arrangements cause a force in the same direction as the original arrangement?
A P, Q and R
B P and Q only
C P only
D R only
Answer/Explanation
Ans: D