A boy presses a book against the front wall such that the book does not move. The force of friction between the wall and the book is

Towards right

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Towards left

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Downwards

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Upwards

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Solution

The correct option is D
Upwards

Frictional force:
Frictional force refers to the force generated by two surfaces that contact and slide against each other.
The force due to gravitation in the book is in the downward direction.
Since the force of friction acts opposite to the force acting on a body to move it, it will be in an upward direction.
Hence, Option D is correct.

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