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

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Attract each other with a force of μ0i2 / 2πd2 per unit length

Repel each other with a force of μ0i2 / 2πd2 per unit length

Attract each other with a force of μ0i2 / 2πd per unit length

Repel each other with a force of μ0i2 / 2πd per unit length

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detailed solution

Correct option is C

Fl = μ04π . 2i1i2a ⇒ Fl = μ04π . 2i2d = μ0i22πdAttractive

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