Download The diagram shows a rigidly-clamped straight horizontal current

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6
A coil, mounted on an axle, has its plane parallel to the flux lines of a uniform magnetic field B, as
shown. When a current I is switched on, and before the coil is allowed to move,
A
there are no forces due to B on the sides PQ and RS.
B
there are no forces due to B on the sides SP and QR.
C
sides SP and QR attract each other.
D
sides PQ and RS attract each other.
(Total 1 mark)
7
The diagram shows a magnet placed on a top-pan balance. A fixed horizontal wire, through
which a current can flow, passes centrally through the magnetic field parallel to the pole-pieces.
With no current flowing, the balance records a mass of 201.32 g. When a current of 5.0 A flows,
the reading on the balance is 202.86 g.
(a)
(i)
Explain why the reading on the balance increased when the current was switched on.
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