Question

Assertion :For practical purposes, the earth is used as a reference at zero potential electrical circuits. and Reason: The electrical potential of a sphere of radius $R$ with charge $Q$ uniformly distributed on the surface is given by $\frac{Q}{4\pi {\epsilon }_{0}R}$

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

The earth is a neutral conductor which is at zero potential. And as earth have negligible amount of charge so for a conducting body the potential at the surface is.

$V=\frac{Q}{4\pi {\epsilon }_{o}R}V\approx 0$