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Q.

Three equal weights A,B and C of mass 2 kg each are hanging on a string passing over a fixed pulley which is frictionless as shown in figure. The tension in the string connecting weight B and C is

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a

zero

b

13 N

c

19.6 N

d

3.3 N

answer is B.

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Detailed Solution

Acceleration of system,

a=Net pulling forceTotal mass

= 4g-2g6=g3

Equation of motion of block C is

mCg=TBC=mCa

∴ TBC=mCg-a=29.8-9.83=13 N

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