Reference Guide

5-32 Equation Reference

Straight Wire (7, 1)

The magnetic field calculation differs depending upon whether the point is inside or outside the wire.

Equation:

Example:

Given:

r=1, rw= 0.25_cm, r=0.2_cm, I=25_A.

Solution:

B= 0.0016_T.

Force between Wires (7, 2)

The force between wires is positive for an attractive force (for currents having the same sign).

Equation:

Example:

Given:

Ia=10_A, Ib=20_A,

r=1, L=50_cm, d=1_cm.

Solution:

Fba=2.0000E–3_N.

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