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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 = ฮผ0I1I2/2ฯ€d Here d = distance = 8 ร— 10-3 meter ฮผย  = 4ฯ€ ร— 10-7 F/m And currents I1 = I2 = 120 Ampere Therefore, F/l = (4ฯ€ ร— 10-7 ร— 120 ร— 120)/(2ฯ€ ร— 8 ร— 10-3) = 0.18 N/m

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