Download The diagram shows a rigidly-clamped straight horizontal current

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Transcript
5
The diagram shows a rigidly-clamped straight horizontal current-carrying wire held mid-way
between the poles of a magnet on a top pan balance. The wire is perpendicular to the magnetic
field direction.
The balance, which was zeroed before the switch was closed, reads 112 g after the switch is
closed. If the current is reversed and doubled, what will be the new reading on the balance?
A
–224 g
B
–112 g
C
zero
D
224 g
(Total 1 mark)
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