Question: A vertical straight wire carrying an upward 28-A current exerts an attractive force per unit length of 7.8 10-4 N/m on a second parallel

A vertical straight wire carrying an upward 28-A current exerts an attractive force per unit length of 7.8 × 10-4 N/m on a second parallel wire 9.0 cm away. What current (magnitude and direction) flows in the second wire?

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