Many of the diagrams given in figure, show magnetic field lines (th...

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Many of the diagrams given in figure, show magnetic field lines (thick lines in the figure). Point out which one is/are correct?
(i)
(ii)
(iii)
(iv)
(a) Both (i) and (iv)
(b) Both (ii) and (iv)
(c) Both (iii) and (iv)
(d) Only (iii)
\( \mathrm{P} \)
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