A horizontal force of 10N is necessary to just hold a block stationary against as well. The coefficient of friction between the block and the wall is 0.2. The weight of the block is

Options

A. `2N`
B. `20N`
C. `50N`
D. `20N`

Answer

A

Explanation

If block does not slide the friction between the block and wall should be static in nature. This friction force perveent the block.
From sliding on the wall From `F.B.D` of the block
`f =mg…(i)`
If block does not side `f le muN`
`rArr mg le muN rArr mg le 0.2 xx 10`
or `mg le 2N`
Hence force necessary to just hold the block should be `2N`
.