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Q.

Two similar metal spheres are suspended by silk threads from the same point. When the spheres are given equal charges of 2μC the distance between them becomes 6cm. If length of each thread is 5 cm, the mass
of each sphere is (g=10 m/s2)

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a

43kg

b

4 kg

c

13kg

d

3 kg

answer is C.

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Detailed Solution

Question Image

F=mgTan⁡θ14πε0q1q2r2=mg349×109×2×10−6×2×10−66×10−22=m×10×3410=m×10×34⇒m=43kg

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