Question

Two parallel wires carry currents of 5 A and 4 A in opposite directions. The wires are separated by a distance of 4 cm. Find the net magnetic field at a point midway between the two wires.

• A. 10 \( \mu T \)
• B. 15 \( \mu T \)
• C. 20 \( \mu T \)
• D. 25 \( \mu T \)

Hint:

To calculate the net magnetic field from multiple sources, sum the individual fields as vectors, keeping track of the direction.

Answer 1

The Correct Option is C

The magnetic field produced by each wire at the midpoint can be calculated using Ampère’s Law, \( B = \frac{\mu_0 I}{2\pi r} \), where \( r \) is the distance from the wire. The net magnetic field is the vector sum of the fields from the two wires, accounting for their opposite directions.