If the key in the given arrangement is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane $ABCD$ , the lines are

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concentric circles

elliptical in shape

straight lines parallel to each other

concentric circles near the point O but of elliptical shapes as we go away from it

answer is A.

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Detailed Solution

If the key of the given arrangement is opened and magnetic field lines are drawn over the horizontal plane

ABCD

, then the lines are in the form of concentric circles.
When the circuit is open, and the magnetic field lines are drawn over the horizontal plane ABCD, the magnetic field lines form concentric circles with the centre at the axis of the conductor. This is because there will be no flow of current and hence no magnetic field due to the conductor. Thus, the magnetic field lines form concentric circles..

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