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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
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
If key is taken out then current will stop and no magnetic field exists due to the conductor. Thererfore, at the point O, there will be earth’s magnetic field and they will be straight lines parallel to each other.
By: santosh ProfileResourcesReport error
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