The earth's magnetic dipole moment is 8.01022Am2 Part A What is the magnetic field strength on the

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Question:

The earth's magnetic dipole moment is 8.0×1022Am2

Part A

What is the magnetic field strength on the surface of the earthat the earth's north magnetic pole? You can assume that the currentloop is deep inside the earth.

Express your answer to two significant figures and include theappropriate units.

I got the answer of 6.2 * 10 ^ (5) t

However, I cannot get part B correct, I tried : 6.21 * 10^( 8),6.3 * 10 ^(8), and 6.1 * 10^(8), none are correct....

I tried the equations and reasoning of previous chegg posts, butthey never turned out correct, I used 63,781,000 m as theequatorial radius of the earth. I don't know what I'm doingwrong.

Part B

Astronauts discover an earth-size planet without a magneticfield. To create a magnetic field at the north pole with the samestrength as earth’s, they propose running a current through a wirearound the equator. What size current would be needed?

Express your answer to two significant figures and include theappropriate units.