Two thin, long, parallel wires, separate...

Two thin, long, parallel wires, separated by a distance 'd' carry a current of 'i' A in the same direction. They will

attract each other with a force of `(mu_(0)I^(2))/((2pid))`

repel each other with a force of `(mu_(0)I^(2))/((2pid))`

attract each other with a force of `(mu_(0)I^(2))/((2pid^(2)))`

repel each other with a force of `(mu_(0)I^(2))/((2pid^(2)))`

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