The magnetic force on wire B due to the current in wire A is

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The magnetic force on wire B due to the current in wire A is Two long parallel conductors carry currents in the same direction as shown. Conductor A carries a current of 150 A, and is held firmly in place. Conductor B is free to move up and down. If the mass per unit length of conductor B is 0.10 kg/m what is the value of the current IB in conductor B so that the net force on conductor B is zero when it is 2.50 cm below conductor A? The magnetic force on wire B due to the current in wire A is This equation was introduced before exam 2, but is “fair game” for exam 3! Similarly, this equation is “fair game” for exam 3: