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If the normal force is doubled and limiting frictional force is maintained at the same value, then the coefficient of friction

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gets quadrupled

remains unchanged

becomes halved

gets doubled

answer is B.

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Detailed Solution

Given that for a normal force = N

Maximum static friction Question Image

Coefficient of static friction Question Image

We can have the relation as Question Image

Now normal reaction is doubled

i.e. Question Image

Maximum static friction is unchanged i.e. Question Image

Now coefficient of static friction will be Question Image

Question Image

Therefore we get coefficient of static friction is halved.

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