Question 32
HThe Figure shows a straight wire seen from one end. The wire is between the poles of a magnet.
The cross shows that the current in the wire is into the paper.
Figure
a.[1]
State the direction of the magnetic field of the magnet between the poles.
b.[1]
Use Fleming's left-hand rule to determine the direction of the force on the wire.
c.[2]
The current in the wire is reversed. The magnet is also turned upside down so that the north pole is at the bottom.
State the direction of the force on the wire now.
Give a reason for your answer.
d.[3]
Explain, in terms of magnetic fields, why there is a force on the wire.