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Q.

In the arrangement shown, each of the blocks A and B has mass ‘m’ coefficient of friction between block B and table top is 0.5. The pulley is light then magnitude of reaction at the spindle of the pulley is _____

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a

mg22

b

32 mg5

c

3mg22

d

22 mg3

answer is C.

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Detailed Solution

Acceleration,   a=mg−0.5 × mg2m=g/4∴tension string, ∴    T=mg−m  ×  g4  =  3mg4∴Reaction at spindle=T2+T2=3mg22
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