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A metal block of mass m is placed on a s...

A metal block of mass m is placed on a smooth metallic plane in support with string as shown in diagram. If after long time due to corrosiom, the contact surface becomes rough with coefficient of friction `mu`, then friction force acting on the block will be :

A

`mu mg cos theta`

B

`mg sun theta`

C

`mg^(1)`

D

None

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The correct Answer is:
D
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