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

Concentric circles

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Elliptical in shape

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Straight lines parallel to each other

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

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Solution

The correct option is B Straight lines parallel to each other
If the key in the arrangement is taken out (the circuit is made open) then there will be no current in the circuit that implies no magnetic field due to the circuit. So only the earth's magnetic field will be present in that region and the field due to it will be straight lines parallel to each other over the horizontal plane ABCD.

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Similar questions

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

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

Question 2
If the key in the arrangement (Figure) is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD, the lines are
(a) concentric circles
(b) elliptical in shape
(c) straight lines parallel to each other
(d) concentric circles near the point O but of elliptical shapes as we go away from it

Question 2
If the key in the arrangement (Figure) is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD, the lines are
(a) concentric circles
(b) elliptical in shape
(c) straight lines parallel to each other
(d) concentric circles near the point O but of elliptical shapes as we go away from it

If the key in the arrangement (Figure) 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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