Each of two long straight parallel wires separated by a distance of 24.0 cm carries a current of 5.00 A in the same direction.What is the magnitude of the resulting magnetic field at a point that is 14.0 cm from each wire?
A)1.25 µT
B)4.27 µT
C)7.36 µT
D)12.8 µT
E)18.4 µT

Question

Quizplus · Accepted Answer

The magnetic field due to each wire at the point can be calculated using the Biot-Savart Law. Since the currents are in the same direction, the fields add up. The distance from the point to each wire forms an isosceles triangle with the wires, and the perpendicular distance from the point to the line joining the wires is used to calculate the field. The resulting field is the vector sum of the fields from both wires.

Each of Two Long Straight Parallel Wires Separated by a Distance