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3.) Two long, parallel wires are separated by a distance of 0.400 m. The
currents I, and la have the directions shown. (a) Calculate the magnitude of
the force exerted by each wire on a 1.20-m length of the other. Is the force
attractive or repulsive? (b) Each current is doubled, so that I becomes 10.0
A and l; becomes 4.00 A. Now what is the magnitude of the force that each
wire exerts on a 1.20-m length of the other?

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