Two Long Straight Current-Carrying Parallel Wires Cross the X Axis

question 45

Multiple Choice

Two long straight current-carrying parallel wires cross the x axis and carry currents I and 3I in the same direction, as shown. At what value of x is the net magnetic field zero?

• A) 0
• B) 1
• C) 3
• D) 5
• E) 7

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