Question

The electric potential at the surface of charged solid is 20 volt.Find the electric potential at its centre .​

Answer 1

Answer:

so the answer is 20 volt

Answer 2

Using Gauss' law, the electric field inside the sphere is:

E=k

r

2

(Qr

3

/R

3

)

=kQr/R

3

, where k=1/4πϵ

o

.

Thus, inside sphere, electric field varies linearly with r.

Now if potential at the surface is V then electric field is Vr/R

2

. So It should be V/2R if distance from the center is R/2.

Thus, both assertion and reason are true but reason is not the correct explanation of the assertion.

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