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Physics-

General

Easy

Question

The magnetic field between the plate of a capacitor where $r greater than R$ is given by (where $r$ is the distance from the axis of plates and $R$ is the radius of each plate of capacitor)

$\frac{μ_{0} i_{D} r}{2 π R^{2}}$
$\frac{μ_{0} i_{D}}{2 π R}$
$\frac{μ_{0} i_{D}}{2 π r}$
Zero

The correct answer is: $fraction numerator mu subscript 0 end subscript i subscript D end subscript over denominator 2 pi r end fraction$

Using Ampere circuit law,
$contour integral stack B with rightwards arrow on top bullet stack d l with rightwards arrow on top equals mu subscript 0 end subscript i subscript D end subscript$
or $B 2 pi r equals mu i subscript D end subscript$
or $B equals mu subscript 0 end subscript i subscript D end subscript divided by 2 pi r$

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