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Q.

A sphere carrying charge 0.01 C is kept at rest without falling down, touching a wall by applying a horizontal electric field 100 N/C. If the coefficient of friction between the sphere and the wall is 0.2 , the weight of the sphere is

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a

20 N

b

2 N

c

0.2 N

d

4N

answer is D.

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Detailed Solution

Question Image

Using equilibrium condition,

$N = Eq and f_{\max} = mg$

$\Rightarrow N = 100 \times 0 \cdot 01 = 1 N$

$f_{\max} = μ N = 0 \cdot 2 \times 1 = 0.2 N$

$\Rightarrow W e i g h t = m g = f_{m a x} = 0.2 N$

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