Two Long Parallel Wires Are a Distance D Apart

question 37

Multiple Choice

Two long parallel wires are a distance d apart.The current in one wire is 10 A and the current in the other wire is 30 A.The currents are in the same direction.If the 30-A current is increased to 50 A,by what factor does the magnitude of the magnetic field midway between the wires change?

• A)2
• B)4
• C)25/9
• D)5/3

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