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April 1, 2015

Homework Help: urgent physics

Posted by sonia on Friday, November 4, 2011 at 3:40pm.

A power line carries a current of 110 A at a location where the Earth's magnetic field has a magnitude of 0.37 Gauss (0.3710-4 T) and points due north, very nearly parallel to the ground. Find the direction and magnitude of the magnetic force exerted on a 270 m length of the power line if the current in the line flows in the following directions:

horizontally toward the east
1.0989 N, upwards
horizontally toward the north
0 N, none of these; force is zero

QUESTION: How far away do you have to get from this power line, before the B field from the power line itself is about as small as the Earth's?

I could not figure out what formula to use to solve this..please help!

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