A) plane surfaces of a bar magnet
B) plane surface of a horse-shoe magnet
C) cylindrical surfaces of a bar magnet
D) cylindrical surfaces of a horse-shoe magnet
Correct Answer: C
Solution :
In a suspended coil galvanometer the strength of the current is not proportional to the deflection\[\phi \]. Hence, the current cannot be read directly. To remove this difficulty, it is necessary that in every position of the coil, the plane of the coil be parallel to the magnetic field. It is for this purpose the coil is suspended between cylindrically cut pole pieces and a soft iron core is placed in the coil without touching it anywhere.
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