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Q.

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 fixed vertical wall to be light and inextensible. Let  TA,TB and TC be the tension in the strings in the figure A, figure B and figure C respectively. Then pick the correct comparison between the given tensions (for the instant shown) from options below 
 

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a

TA=TB=TC

b

TB=TC<TA

c

TA<TB<TC

d

TB<TC<TA

answer is D.

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Detailed Solution

Tension shall be highest in block having least acceleration because it is tension force which decreases acceleration of each block. Therefore TB<TC<TA
 

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