Two wires carrying

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Antiparallel current repel each other

Equal magnitudes of antiparallel current attract each other

parallel current repel each other

Antiparallel current attract each other

answer is C.

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Detailed Solution

Detailed Solution:

The direction of magnetic field can be determined from right hand thumb rule. The direction of magnetic force is given by the cross product $\vec{F} = i (\vec{l} \times \vec{B})$ .

In the case of two wires carrying parallel current, this force on one wire due to the magnetic field of the other is directed towards the other wire. So, wires carrying parallel current attract each other.

In the case of two wires carrying anti-parallel current, this force on one wire due to the magnetic field of the other is directed away from the other wire. So, wires carrying anti-parallel current repel each other.

Hence, the correct option is C.

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