Four, long, parallel power lines each carry 108-A currents. A cross-sectional di

Question

Four, long, parallel power lines each carry 108-A currents. A cross-sectional diagram of these lines is a square, 19.5 cm on each side.

image shown here: http://i1142.photobucket.com/albums/n603/bdoneski/28-p-023.gif

(a) For case (a) shown in the figure above, calculate the magnetic field at the center of the square.
magnitude? T
direction?

(b) For case (b) shown in the figure above, calculate the magnetic field at the center of the square.
magnitude? T
direction?

(c) For case (c) shown in the figure above, calculate the magnetic field at the center of the square.
magnitude? T
direction?

Explanation / Answer

a.) taking care of direction of magnetic field
force = 0N
b) force = 0N

c.) magnetic field at a distance r from long wire = o*I/2r

net magnetic field = 2A+2B

where A = o*I/2r (-i +j)

B = o*I/2r (-i -j)

net field = -2oI/r i

magnitude = 3.133 *10^-4 T

direction = -xve axis

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