CBSE Class 10 Answered

Using the right hand rule to find the direction of magnetic field shows that the direction of magnetic field generated by one conductor is in opposite direction to the magnetic field generated by second conductor, and again as the amounts of current are same, and the midpoint is at equal distances from the conductors, the magnetic field due to first conductor has same magnitude as that by second conductor.

They cancel each other, hence the magnetic field is zero.

If the direction of current in any of the conductor is revsered, the both the magnetic fields will point in the same direction, and we'll have nonzero magnetic field at the mid point.

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