O-LevelPhysicsMagnetism5054/12 · Oct/Nov 2017 · Q341 Mark

A straight wire carries a current into the paper. The diagram shows three magnetic field lines around the wire. The current in the wire increases. What is the direction of the field lines and which change occurs to the field lines as the current increases?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

Aclockwise, the lines move closer together

Bclockwise, the lines move further apart

Canticlockwise, the lines move closer together

Danticlockwise, the lines move further apart

✓ Correct answer

A: clockwise, the lines move closer together

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