If the key in the given circuit arrangement is closed the magnetic field lines drawn over the ho...

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If the key in the given circuit arrangement is closed the magnetic field lines drawn over the horizontal plane \( \mathrm{ABCD} \), are
a. Concentric circles
b. Elliptical in shape
c. Straight lines parallel to each other
d. Concentric circles near the point \( \mathrm{O} \) but of elliptical shapes as we go away from it
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