# Homework Help: B field created by a long straight current carrying wire.

1. Sep 21, 2008

### hannaht

Hi. I have a problem regarding a lab. experiment question.

1. The problem statement, all variables and given/known data

An alternating current is made to run through a long straight wire, thus creating a time varying B field in the region surrounding the wire. A small inductor coil is then placed near the wire. The voltage induced in the coil is measured as the distance of the coil from the wire is varied.
Then, the voltage induced in the coil is measured as the frequency of the alternating current through the long wire is varied.

Can someone help explain to me how the induced voltage in the inductor coil comes about. Also, how is the induced voltage (and thus B-field) dependent on the distance of the coil from the long wire, and on the frequency of the ac current flowing in the long wire?

(The full details of the experiment are in the attactment) Thanks.

2. Relevant equations

3. The attempt at a solution

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