Physics
Two infinitely long parallel wires carry equal currents in the same direction. The magnetic field at the mid-point in between the two wires is :
- Twice the magnetic field produced due to each of the wire.
- Half of the magnetic field produced due to each of the wire.
- Zero
- Square of the magnetic field produced by each wire.
Electro-Magnetism
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Answer
Zero
Reason — When two infinitely long parallel wires carry equal currents in the same direction, each wire produces a magnetic field around it according to the right-hand thumb rule.
At the mid-point between the wires, the magnetic field due to one wire is equal in magnitude but opposite in direction to that due to the other wire.
Since these fields act in opposite directions, they cancel each other exactly, resulting in a net magnetic field of zero at the midpoint.
Hence, the magnetic field at the mid-point in between the two wires is zero.
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