‹ Back to the paper
Choose the correct option.
A hollow sphere of radius R has a point charge Q at its centre. Electric flux emanating from it is…
A hollow sphere of radius $R$ has a point charge $Q$ at its centre. Electric flux emanating from it is $\phi$. If both the charge and the radius of the sphere be doubled, electric flux emanating from the sphere will:
- (a)remain the same.
- (b)become $2\phi$
- (c)become $4\phi$
- (d)become $8\phi$
Answer
Answer
Correct option: (b)
Answer: (b) become $2\phi$
By Gauss's law $\phi = Q/\epsilon_0$, which does not depend on the radius, so doubling $Q$ doubles the flux.