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Question

In the following figure force F is gradually increased from zero. Draw the graph between applied force F and tension T in the string. The coefficient of static friction between the block and the ground is μs.


A

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B

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C

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Solution

The correct option is B


As the external force F is gradually increased from zero it is compensated by the friction and the string bears no tension. When limiting friction is achieved by increasing force F to a value till μs mg, the further increase in F is transferred to the string.

When[F<μsmg;The friction is static and T = 0Fμsmg;T=Fμsmg]


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