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Question
A block of mass 20 kg lying on a rough horizontal plane is connected by a light string passing over a smooth pulley to another mass 5 kg, which can move freely in the vertical direction, as shown in the below figure. the tension in the string will ___________ with the increase in coefficient of friction.
Options:
A .   Increase
B .   Decrease
C .   Not be effected
D .   None of these
Answer: Option A

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