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The figure shows a spool placed at rest ...


The figure shows a spool placed at rest on a horizontal rough surface. A tightly wound string on the inner cylinder is pulled horizontally with a force F. identify the correct alternative related to the friction f acting on the spool

A

`f` acts left ward with `fltF`

B

`f` acts leftwards but nothing can be said about its magnitude

C

`fltF` but nothing can be said about its magnitude.

D

none of the above

Text Solution

Verified by Experts

The correct Answer is:
A

Torque of `F` about `P` is clockwise So, spool wil move towards right. Torque of friction will provide the clockwise torque about centre so `f` leftwards further, `a` is towards right so `Fgtf`
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