If the key in the arrangement as shown below is taken out the circuit is made open and magnetic fiel...........

Physics Chapter - 13

If the key in the arrangement as shown below is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD, the lines are [NCERT Exemplar]

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

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Explanation:

When the key is taken out (the circuit is made open), no current flows through the wire, hence no magnetic field exists due to the conductor.
The only magnetic field is due to Earth’s magnetic field and are straight lines parallel to each other. The horizontal component is directed from geographical South to geographical North on the horizontal plane ABCD.

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