Need help solving Parts A, B, C, and D for the question below:

A power line carries a current of 93 AA west along the tops of 8.5-mm-high poles.

Part A: What is the magnitude of the magnetic field produced by this wire at the ground directly below?

Part B: What is the direction of the magnetic field produced by this wire at the ground directly below?

1. East

2. West

3. South

4.North

Part C: How does this compare with the Earth's magnetic field of about 1/2 G?

Part D: Where would the wire's magnetic field cancel the Earth's field?