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Prove that magnetic force per unit lengt...

Prove that magnetic force per unit length on each of the infinitely long wire due to each other is `mu_(0)I_1I_(2)//2pid`.Here it is attractive also.

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On (2) ,`B` due to (i) is `=(mu_(0)l_(1))/(2pid)ox`
`:. F` on `(2)` on `1m` length
`=I_(2).(mu_(0)I_(1))/(2pid).1 ` towards left is attractive
`=(mu_(0)I_(1)I_(2))/(2pid)` (hence proved)
Similarly on the other wire also.
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