Who discovered for the first time that a changing electric field can produce a magnetic field?

The Maxwell-modified form of Ampere's circuital law is .......

The Hertz experiment is used for:

What is called displacement current?

The source of an electromagnetic wave can be a charge

Suppose that the electric flux inside a parallel plate capacitor changes at a rate of $7 \times 10^{14} \text{ V} \cdot \text{m/s}$. If the area of the plates is $1 \text{ m}^2$,calculate the magnetic field $B$ at a distance $r = 0.1 \text{ m}$ from the axis of the capacitor. (Given: $\varepsilon_0 = 8.85 \times 10^{-12} \text{ F/m}$,$\mu_0 = 4\pi \times 10^{-7} \text{ T} \cdot \text{m/A}$)