First slide

Electric field

Question

Two particles each having a Mass of 5g and charge $1 \times 10^{- 7} C$ , 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

Moderate

Solution

$F o r c e b e t w e e n t w o p a r t i c l e s F = \frac{9 \times 10^{9} \times {(1 \times 10^{- 7})}^{2}}{{(0.10)}^{2}} = 0.009 N T h e f r i c t i o n a l f o r c e i n l i m i t i n g e q u i l i b r i u m f = μ m g \Rightarrow f = μ (0.049) [m g = 5 \times 10^{- 3} \times 9.8 = 0.049] A t t h e s e f o r c e s b a l a n c e e a c h o t h e r 0.049 μ = 0.009 \Rightarrow μ = \frac{0.009}{0.049} \Rightarrow μ = 0.18$

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