Q.

Two particles each having a Mass of 5g and charge 1×10−7C  , stays in limiting equilibrium on a horizontal table with a separation of 10cm between them. The coefficient of friction between each particle and the table is same. Find the value of coefficient of friction

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answer is 0.18.

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Detailed Solution

Force between two particles  F=9×109×1×10−720.102 = 0.009 N  The frictional force in limiting equilibrium  f=μmg ⇒f=μ0.049   mg=5×10−3×9.8=0.049  At these forces balance each other 0.049μ=0.009 ⇒μ=0.0090.049 ⇒μ=0.18
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