I'm kinda stuck on this question:(adsbygoogle = window.adsbygoogle || []).push({});

1. Calculate the magnitude ofthe magnetic f ield at a point midway between two

long, parallel wires that are 1 .0 m apar t and have currents of1 0.0 A and 20.0 A,

respectively, ifthe currents are (a) in opposite directions and (b) in the same

direction.

The answer is

(a) 1.2 x 10^-5 T

(b) 4.0 x 10^-6 T

2. Also, this question (i thought it was easy, but i kept on getting 4.0 x 10^-5, but the answer is 1.0 x 10^-5).

A long, solid, copper rod has a circular cross-section ofdiameter 10.0 cm. The

rod has a current of5.0 A, uniformly distributed across its cross-section.

Calculate the magnetic field strength 2.5cm from the centre of the rod.

P.S. At this point, the only equation i am using is

B = (mew)oI

2(pi)r

Where (mew)o is the is a proportionality constant,called the permeability of free space.

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# Homework Help: Ampere's Law

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