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Q.

A ball of mass ‘m’ is rotated in a vertical circle with constant speed. The difference in tension at the top and bottom would be

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a

6mg

b

5mg

c

2mg

d

mg

answer is C.

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Detailed Solution

tension in string at lowest point TL=mv2r+mg---(1) tension in string at highest point TH=mv2r-mg---(2) here body has constant speed v difference in tension is from eqn(1)-eqn(2)  TL- TH=2mg where m is mass of the body, g i acceleration due to gravity
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