Question

Two long straight parallel wires carry the same current but in opposite directions. Which of the following statements is CORRECT about the field between the two wires.

a. Field is uniform between the two wires.
b. There is no field between the two wires.
c. Field between the two wires is stronger compared with the sides.
d. Field between the two wires is weaker compared with the sides.

Answer 1

The magnetic field between two long straight parallel wires carrying current in opposite directions is weaker compared to the sides due to the opposing magnetic fields produced by each wire.

Step-by-step explanation:

When two long straight parallel wires carry the same current but in opposite directions, the magnetic fields due to each wire will interact. According to the right-hand rule (RHR-2), the magnetic field produced by a long straight conductor is perpendicular to a parallel conductor. As the currents are in opposite directions, the magnetic fields around each wire will oppose each other between the wires. This interaction results in the magnetic field between the wires being weaker compared to the sides where the fields due to each wire add up. Therefore, the correct answer is (d) The field between the two wires is weaker compared with the sides.