# PHYS 102 Lecture Notes - Electromagnet, Inverse-Square Law

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26 Jun 2012
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## Document Summary

Imagine holding the wire carrying the current with your right hand, the thumb in the direction of the current. Your fingers will then give the sense of direction of the magnetic field b. A circle with a dot coming out of it is a vector pointing out of the plane. A circle with an x is a vector pointing into the plane. The simple right hand rule applies to many geometries including current in a loop: Determination of magnetic field strengths produced by electric. P (the current does not produce a field on: deltab ~ sin j itself. Phys 102 alanna houston: putting it all together, o, the proportionality constant (biot-savart law) o o, for a medium other than vacuum, we replace mu not by mu, the permeability of the medium. The direction of the b-field is determined directly by the right hand rule. The b-field at the centre of a circular current loop of radius r: