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A block of mass m is held fixed against ...

A block of mass `m` is held fixed against a wall by a applying a horizontal force `F`. Which of the following option is incorrect :
.

A

friction force = mg

B

`F` will not produce torque

C

normal will not produce torque

D

normal reaction = F

Text Solution

Verified by Experts

The correct Answer is:
C
This is the equilibrium of coplanar forces. Hence,
`sum F_(x) = 0`
:. `F = N`
:, `sum F_(y) = 0`
`f = mg`
`sum tau_(C) = 0`
:. `vec tau_(N) + vec tau_(f) = 0`
:. Since `vec tau_(f) ne 0` :. `vec tau_(N) ne 0`
:. Correct Answer is `(C)`.
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