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Solved Problems-11

Determine the force between two parallel circular coaxial coils of radius ‘R’ which are a small distance ‘d’ apart in free space and carry currents I1 and I2. Assume that each of the coils has a single turn.
As the distance between the coils is very small compared to the radius of the coils, the two coils can be treated as parallel current-carrying wires. The force on one of the coils (say C1) per unit length due to the other coil (say C2) can be written as,
Description: Description: 105485.png
Therefore, the net force is given as, Description: Description: 105477.png
Parallel coaxial circular coils


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