The figure shows \( n \) ( \( n \) being an even number) wires plac...

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The figure shows \( n \) ( \( n \) being an even number) wires placed along the surface of a cylinder of radius \( r \). Each wire carries current \( i \) in the same direction. The net magnetic field on the axis of the cylinder is
(a) \( \mu_{0} n i \)
(b) \( \frac{\mu_{0} n i}{2 \pi r} \)
(c) zero
(d) \( \frac{\mu_{0} n i}{4 \pi r} \)
\( \mathrm{P} \)
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