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I2
Four long, parallel wires are located at the corners of a square of side a =
20 cm, as shown in the figure above, where I = 8 A,
I2 = 3 A, I3 = 8 A, I4 = 1 A. Find:
a) the resultant magnetic field at the center of the square:
Î+
j+
k) T.
b) the force on an electron moving at 5 x 10° i m/s as it passes the center:
it
j+
k) N

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