A circular parallel plate capacitor of radius $R$ and spacing $d$ is being charged by a constant current…

A circular parallel plate capacitor of radius $R$ and spacing $d$ is being charged by a constant current $I_D$. Find the magnetic field between the plates at a distance $r$ from the axis, where $r>R$.
  1. $\frac{\mu_0 \delta_0^r}{2 \pi R^2}$
  2. $\frac{\mu_0{ }^{\prime} D}{2 \pi R}$
  3. $\frac{\mu_0 / D}{2 \pi r}$
  4. Zero

Solution

The given situation is shown in the following figure.
Magnetic field at point $P$ at a distance $r \diamond R)$ due to current $I_D$ is given as $B=\frac{\mu_0}{2 \pi} \cdot \frac{I_D}{r} \quad\left[\because B=\frac{\mu_0}{2 \pi} \cdot \frac{I}{r}\right]$

Asked in: MHT CET Full Test 13

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