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Q.

A conducting sphere of radius 10cm is charged with 10µC . Another uncharged sphere of radius 20cm is allowed to touch it for some time. After that if the spheres are separated, then surface density of charges on the spheres will be in the ratio of

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a

1 : 4

b

2 : 1

c

1 : 3

d

1 : 1

answer is B.

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Detailed Solution

$V_{A} = V_{B}; \frac{σ_{A}}{σ_{B}} = \frac{q_{A}}{q_{B}} \cdot \frac{R_{B}^{2}}{R_{A}^{2}}$

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