First slide

Displacement current

Question

A condenser is charged using a constant current. The ratio of the magnetic fields at a distance of R/2 and R from the axis is (R is the radius of plate)

Moderate

A

1 : 1
B

2 : 1
C

1 : 2
D

1 : 4

Solution

$\begin{array}{rcl} B & = & \frac{μ_{0} i_{d} . r}{2 {πR}^{2}}; \\ Bα r; \\ \frac{B_{1}}{B_{2}} & = & \frac{r_{1}}{r_{2}} = \frac{R / 2}{R} = \frac{1}{2} \end{array}$

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