Directions : These questions consists of two statements each printed as Assertion and Reason. While answering these questions you are required to choose any one of the following four responses
Assertion : In the system of two blocks of equal masses as shown, the coefficient of
friction between the blocks ( $μ_{2}$ ) is less than coefficient of friction $μ_{1}$ ) between lower block and ground.

For all values of force F applied on upper block, lower block remains at rest.
Reason : Frictional force on lower block due to upper block is not sufficient to overcome the frictional force on lower block due to ground.

Moderate

A

If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
B

If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
C

If Assertion is true but Reason is false.
D

If Assertion is false but Reason is true.

Solution

${(f_{2})}_{\max} = μ_{2} m g$
${(f_{1})}_{\max} = μ_{1} (2 m) g$
Since, ${(f_{1})}_{\max} > {(f_{2})}_{\max}$
Lower block will not move at all.

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