Assertion :Static friction is as self-adjusting force upto its limit $μ_{s} N$ where $μ_{s}$ is the coefficient of static friction. Reason: One can use the equation $f_{s} = μ N$ only when the maximum value of static friction comes into play.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Static friction resists the tendency of motion by providing only the required amount of force to counterbalance the external force. Thus it can be said to be self adjusting. The maximum value of friction is given by μN which is also called the limiting friction.

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Assertion :Static friction is as self-adjusting force upto its limit μsN where μs is the coefficient of static friction. Reason: One can use the equation fs=μN only when the maximum value of static friction comes into play.

Assertion :Static friction is as self-adjusting force upto its limit $μ_{s} N$ where $μ_{s}$ is the coefficient of static friction. Reason: One can use the equation $f_{s} = μ N$ only when the maximum value of static friction comes into play.