Question

Earth is taken as zero electric potential, through it has net negative charge because of
a.its layer radius
b.its smaller radius
c.heavy mass
d.its large permittivity

Answer 1

Answer:

"Its larger radius"

Explanation:

The electric potential is given by :

$V=\dfrac{kQ}{r}$

Where

k is the electrostatic constant

Q is electric charge

r is the radius

For Earth, the value of r is very large and Q is very smaller. Due to large r, the potential of Earth's surface is almost zero. Hence, the correct option is (a).