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If the key in the arrangement is taken out (the circuit is made open) and magnetic field linesare drawn over the horizontal plane ABCD, the lines are13.Variable resistance(A) concentric circlesA Long straightconductor(B) elliptical in shape(C) straight lines parallel to each other(D) concentric circles near the point O but ofelliptical shapes are we go away from it |
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Answer» (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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