Two long parallel wires 15 cm apart carry currents of 5.0 A and 8.0 A in the same direction.Is there any point between the two wires where the magnetic field is zero?
A) yes,midway between the wires
B) yes,9.2 cm from the 5 A wire
C) no
D) yes,5.8 cm from the 5 A wire

Question

Quizplus · Accepted Answer

The magnetic field due to each wire is inversely proportional to the distance from the wire. For the fields to cancel each other out, the point must be closer to the weaker current (5 A). Using the formula for magnetic fields around a wire and setting them equal, the point is found to be 5.8 cm from the 5 A wire.

Two Long Parallel Wires 15 Cm Apart Carry Currents of 5.0