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evablogger [386]

2 years ago

14

The earth's magnetic moment is 8 x 1022 a-m2. If that moment were created by a loop of wire going around the earth (r = 6378 km)

, what current would need to go through the wire in a?

1 answer:

Elena L [17]2 years ago

4 0

Answer:

M = I A definition of magnetic moment - current * area

A = π R^2 = π * (6.4E6)^2 = 1.3E14 m^2

I = 8E22 A-m^2 / 1.3E14 m^2 = 6.2E8 amperes

I = 620,000,000 amps

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