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Questions  

Consider the three cases given in figures shown. Assume the friction to be absent everywhere and the pulleys to be light; the string connecting the blocks to other block or flxed vertical wall to be light and inextensible . Let TA, TB and TC be the tension in the strings in figure A, figure B and figure C respectively. Then pick the correct comparison between the given tensions (for the instant shown) from options below.

a
TA = TB = TC
b
TB = TC < TA
c
TA < TB < TC
d
TB < TC < TA

detailed solution

Correct option is B

TA =2kgf.TB=Total forcetotal mass×Horizontally moving mass=2(1+2)×1=23kgf.Similarly TC=1(2+1)×2=23kgf.Hence TB=TC

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