Download The diagram shows a rigidly-clamped straight horizontal current

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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 SP and QR.
B
there are no forces due to B on the sides PQ and RS.
C
sides SP and QR tend to attract each other.
D
sides PQ and RS tend to attract each other.
(Total 1 mark)
12
(a)
A satellite moves in a circular orbit at constant speed. Explain why its speed does not
change even though it is acted on by a force.
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(3)
(b)
At a certain point along the orbit of a satellite in uniform circular motion, the Earth’s
magnetic flux density has a component of 56 μT towards the centre of the Earth and a
component of 17 μT in a direction perpendicular to the plane of the orbit.
(i)
Calculate the magnitude of the resultant magnetic flux density at this point.
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