If the key in the arrangement (Figure 13.1) 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
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Solution

(c) straight lines parallel to each other.
And this is because of earth's magnetic field as there is no magnetic field due to wire.

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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, 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:

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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(c) straight lines parallel to each other.And this is because of earth's magnetic field as there is no magnetic field due to wire.

(c) straight lines parallel to each other.
And this is because of earth's magnetic field as there is no magnetic field due to wire.