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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 $r>R$.
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Verified Answer
The correct answer is:
$\frac{\mu_0 / D}{2 \pi r}$
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
$$
B=\frac{\mu_0}{2 \pi} \cdot \frac{I_D}{r} \quad\left[\because B=\frac{\mu_0}{2 \pi} \cdot \frac{I}{r}\right]
$$
Magnetic field at point $P$ at a distance $r \diamond R)$ due to current $I_D$ is given as
$$
B=\frac{\mu_0}{2 \pi} \cdot \frac{I_D}{r} \quad\left[\because B=\frac{\mu_0}{2 \pi} \cdot \frac{I}{r}\right]
$$
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