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Electromagnetism

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Question 17

Magnetic field lines show the shape and direction of a magnetic field.

a.

The diagram shows a cross-section through a wire placed between two magnetic poles. The wire carries electric current into the page at W\mathbf{W}W. The shape of the magnetic field is shown.

A wire cross-section labeled W with a cross in the center, representing current flowing into the page. The wire is positioned horizontally between a North (N) pole on the left and a South (S) pole on the right. The magnetic field lines are shown. Above the wire, the field lines are closely spaced and curve upwards. Below the wire, the field lines are much further apart and bend downwards.

State the direction of the magnetic field lines in this diagram (including the direction from pole to pole and the direction of the loops around the wire).

[2]
b.

Determine the direction of the electromagnetic force acting on the wire.

[1]
c.

The wire is removed and the magnetic field between the poles changes. Describe the shape, spacing, and direction of the new magnetic field lines between the North pole (left) and South pole (right).

[3]
d.

Describe a procedure to map the shape and direction of the magnetic field lines around a bar magnet using a single plotting compass.

[4]

Electromagnetism Questions

  1. IGCSE
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  3. /Electromagnetism