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Find the interaction energy of two loo...

Find the interaction energy of two loops carrying currents `I_(1)` and `I_(2)` if both loops are shaped as circles of radii `a` and `b`, with `a lt lt b`. The loops centres are located at the same point and their planes from an angle `theta` between them.

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The correct Answer is:
`[(m_(0))/(2b).pia^(2)I_(1)I_(2)cos theta]`
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