Two Parallel Wires, 4 Cm Apart, Carry Currents of 2

question 20

Multiple Choice

Two parallel wires, 4 cm apart, carry currents of 2 A and 4 A respectively, in opposite directions.The force per unit length of one wire on the other is:

• A)1 *10^-3 N/m, repulsive
• B)1 *10^-3 N/m, attractive
• C)4 * 10^-5 N/m, repulsive
• D)4 * 10^-5 N/m, attractive
• E)none of these

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