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    Question

    Two long parallel conductors are placed 8mm apart from

    each other carrying a current of 120 Amperes. What will be force per meter length of each one?
    A 0.18 N/m Correct Answer Incorrect Answer
    B 0.08 N/m Correct Answer Incorrect Answer
    C 0.13 N/m Correct Answer Incorrect Answer
    D 0.20 N/m Correct Answer Incorrect Answer

    Solution

    We know the force per unit length between the two conductors is F/l = ╬╝0I1I2/2╧Аd Here d = distance = 8 ├Ч 10-3 meter ╬╝┬а = 4╧А ├Ч 10-7 F/m And currents I1 = I2 = 120 Ampere Therefore, F/l = (4╧А ├Ч 10-7 ├Ч 120 ├Ч 120)/(2╧А ├Ч 8 ├Ч 10-3) = 0.18 N/m

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