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Q.

A rectangular body is held at rest by pressing it against a vertical wall for which μ < l. Which of the following is generally true?

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a

It will be easier to hold the body if the surfaces in contact are smooth.

b

Pressing force required is smaller than weight rng of the body

c

Pressing force required is greater than weight mg of the body

d

The required pressing force is independent of coefficient of friction between surfaces in contact.

answer is C.

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Detailed Solution

f = MgF < f1Mg < μF                  ⇒ f > Mgμ>Mg
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