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Question
Show with the help of a diagram how the force between the two conductors would change when the currents in them flow in the opposite directions?
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Solution
Now, let the direction of current in conductor b be reversed. The magnetic field B2 at point P due to current Ia flowing through a will be downwards. Similarly, the magnetic field B1 at point Q due to current Ib passing through b will also be downwards as shown. The force on a will be, therefore, towards the left. Also, the force on b will be towards the right. Hence, the two conductors will repel each other as shown.
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