We assume that earth is at zero potential because capacitance of the earth is

infinite

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zero

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cannot say

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10^{6} f a r a d

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Solution

The correct option is A. infinite.
We know that,
$Q = C \times V$ .
Where C is the capacity to store charge,
V is potential
Q is charge.
Because earth can store infinite charge so its capacitance is infinite.
We have,
V = Q/C.
Putting C = infinity
$V = \frac{Q}{\infty} = 0$ .
Thus electric potential of the Earth comes out to be 0.

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We assume that earth is at zero potential because capacitance of the earth is

The correct option is A. infinite.We know that,Q=C×V.Where C is the capacity to store charge,V is potentialQ is charge.Because earth can store infinite charge so its capacitance is infinite.We have,V = Q/C.Putting C = infinityV=Q∞=0 .Thus electric potential of the Earth comes out to be 0.