91影视

Figure 32-19a and 32-19b.

鈥榓鈥� and 鈥榖鈥� are equidistant from the central axis. Also 鈥榗鈥� and鈥榙鈥� are equidistant from it.

From the magnetic field formulas inside and outside the circular capacitor, determine the relationship between magnetic field and distance from the central axis. Find the three points on the curve that correspond to the four points of Fig. 32-19a by using this information and examining the graph and the provided figure.

The formula is as follows:

The magnetic field at a point inside the capacitor is given by

$B=\left(\frac{{\mathrm{渭}}_0{\mathrm{l}}_{\mathrm{d}}}{2{\mathrm{蟺搁}}^2}\right)r$

It implies that$B鈭�r$.

The curve on which point 2 is present satisfies this condition, and there is only one point inside the capacitor 鈥榖.鈥�

Hence, point 2 corresponds to point b.

The magnetic field at a point outside the capacitor is given by

$B=\left(\frac{{\mathrm{渭}}_0{\mathrm{l}}_{\mathrm{d}}}{2\mathrm{蟺谤}}\right)$

It implies that $B鈭�\frac{1}{r}$.

The curves on which points 1 and 3 are present satisfy this relation.

Point '1' corresponds to point 'a' since points 'a' and 'b' are equally spaced apart.

Points 'c' and 'd' correspond to the last point 3, which is left.

Hence, the three points on the curve corresponding to the four points of Fig.32-19 are 1a, 2b, 3c, and d.

While outside of a circular capacitor, the magnetic field is inversely proportional to the distance from the circular plate's centre, inside a circular capacitor, it is proportional to that distance.