Magnetic field strength at the centre of regular pentagon made of a...
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7Magnetic field strength at the centre of regular pentagon made of a conducting wire of uniform cross section area as shown in figure is :
(A) \( \frac{5 \mu_{0} \mathrm{i}}{4 \pi \mathrm{a}}\left[2 \sin \frac{72^{\circ}}{2}\right] \)
(B) 0
(C) Not zero if current 'i' leaves \( D \) point instead of \( E \)
(D) Zero even if the current 'i' leaves point \( D \) instead of point \( E \)
\( \mathrm{P} \)
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