Discussion
The brake magnet in an energy meter produces:
Answer: A
The brake magnet of an energy meter is a permanent magnet placed so that the aluminium disc rotates between its poles. The eddy currents induced in the moving disc produce a force that opposes the rotation, and this is the opposing, or braking, torque that acts against the turning torque of the disc and makes its speed proportional to the power. A controlling torque belongs to the spring of a pointer instrument, and a deflecting torque is the driving torque from the coils. The answer is option (A).
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