Question

1. Assume that earth has a surface charge density of 1 electron per
metre?. Calculate the earth's electric field.​

Answer 1

Answer:

Surface charge density of the earth, ÃÆ’ = 10 - 9 C m - 2

Current over the entire globe, I = 1800 A

Radius of the earth, r = 6.37 × 106 m

Surface area of the earth,

A = 4πr2

= 4π × (6.37 × 106)2

= 5.09 × 1014 m2

Charge on the earth surface,

q = ÃÆ’ × A

= 10 - 9 × 5.09 × 1014

= 5.09 × 105 C

Time taken to neutralize the earth's surface = t

Current,

Therefore, the time taken to neutralize the earth's surface is 282.77 s.