Discussion
In an energy meter the friction produced by the rotating aluminium disc is compensated by:
Answer: A
In an energy meter, friction of the rotating aluminium disc and of the registering mechanism would make the disc turn too slowly at light loads. To compensate, a shading ring or a shading loop is placed on the central limb of the shunt magnet and adjusted, so that the small extra torque it produces just cancels the friction. The brake magnet gives the braking torque and the control spring is not used in a meter, and the registering mechanism only counts the turns. The answer is shading ring, option (A).
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