Twio thin long parallel wires seprated...

Twio thin long parallel wires seprated byb a distance b are carrying a current i ampere each . The magnitude of the force per unit length excrted by one wire on . The other is

`(mu_(0)i^(2))/(b^(2))`

`(mu_(0)i^(2))/(2pib)`

`(mu_(0)i))/(2pib)`

`(mu_(0)i))/(2pib^(2))`

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