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A girl holds a book of mass m against a ...

A girl holds a book of mass m against a vertical wall with a horizontal force F using her finger so that the book does not move. The frictional force on the book by the wall is –

A

F and along the finger but pointing towards the girl

B

`muF` upwards where `mu` is the coefficient of static friction

C

mg and upwards

D

Equal and opposite to the resultant of F and mg

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The correct Answer is:
C
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