For controlling the vibration of the disc of ac energy meter, damping

1.	For controlling the vibration of the disc of ac energy meter, damping torque is produced by
A.	Eddy current
B.	Chemical effect
C.	Electrostatic effect
D.	Magnetic effect
Answer» B. Chemical effect

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Directions: It consists of two statements, one labeled as the 'Statement (I)' and the other as 'Statement (II)'. Examine these two statements carefully and select the answer using the codes given below:Statement (I): For an energy meter, careful design and treatment of breaking magnet during its manufacture are essential in order to ensure consistency of break magnet during the use of the meter.Statement (II): Steady rotational speed of energy meter disc is directly proportional to flux of the break magnet.
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For controlling the vibration of the disc of ac energy meter, damping torque is produced by

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