Solved Problems
1. Find the force with which two parallel conductors of the same length, carrying the same
current interact with each other (i) in the same direction (ii) in the opposite direction.
Solution
2. Find magnetic field at the center of a current carrying square coil of a wire.
Solution
i.e. Same as for infinitely long conductor.
For the given square loop, 'B' due to each area is same in magnitude and direction (which is
perpendicular and outward of the plane of diagram)
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