Questions

Two insulated charged· conducting spheres of radii 20 cm and 15 cm, respectively, and having an equal charge of 10 C are connected by a copper wire and then they are separated. Then

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both the spheres will have the same charge of 10 C

surface charge density on the 20 cm sphere will be greater than that on the 15 cm sphere

surface charge density on the 15 cm sphere will be greater than that on the 20 cm sphere

surface charge density on the two spheres will be equal

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detailed solution

Correct option is C

After redistribution, charges on them will be different, but they will acquire common potential i.e.,kQ1r1=kQ2r2⇒Q1Q2=r1r2 As σ=Q4πr2⇒σ1σ2=Q1Q2×r22r12 ⇒σ1σ2=r2r1⇒σ∝1ri.e., surface charge density on smaller sphere will be more.

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Similar Questions

Two spherical shells are as shown in figure.

Let r be the distance of a point from their common centre. Then, match the following columns and mark the correct choice from the given codes.

	Column-I		Column-II
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