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Questions  

The restoring force which brings the bob towards the mean position is equal to

a
Weight of bob
b
Radial component
c
Tangential component of weight of bob
d
Resultant of radial and tangential component of weight of bob

detailed solution

Correct option is C

Resultant tangential component of all forces is the restoring force. Since tension T is radially inward, it has no tangential component  Restoring force = mgsin

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