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A rough vertical board has an accelerati...


A rough vertical board has an acceleration `a` so that a 2 kg block pressing against it dows not fall. The coefficient of friction between the block and the board should be

A

`(gtg)/(a)`

B

`(ltg)/(a)`

C

`(=g)/(a)`

D

`(gta)/(g)`

Text Solution

Verified by Experts

The correct Answer is:
A

For the limiting condition upward friction force between board and block will balance the weight of the block.
i.e., `Fgtmg`
`impliesmu(R )gtmg`
`impliesmu(ma)gtmg`
`impliesmugt(g)/(a)`
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