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Q.

Two metallic spheres of radii 1 cm and 3 cm are given charges of -1 x 10-2 C and 5 x 10-2 C, respectively. If these are connected by a conducting wire, the final charge on the bigger sphere is :

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a

2 x 10-2 C

b

1 x 10-2 C

c

4 x 10-2 C

d

3 x 10-2 C

answer is D.

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Detailed Solution

Total charge = -1 x 10-2 C + 5 x 10-2 C = 4 x 10-2 C

As, q1 : q2=r1 : r2=1 : 3

So, q2=34 x 4 x 10-2C=3 x 10-2C

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