Ten questions. The result tells you which lessons you may skip.
A transformer has \(400\) turns on its primary and \(100\) on its secondary. With \(220\,\text{V}\) on the primary, the secondary gives
An ideal transformer raises \(220\,\text{V}\) to \(2200\,\text{V}\). Its secondary supplies \(1\,\text{A}\). The primary draws
The core of a transformer is built from thin insulated sheets in order to reduce
The same power is sent along a line at ten times the voltage. The power lost in the line becomes
A \(4\,\mu\text{F}\) capacitor oscillates with a \(0.1\,\text{H}\) coil. Its angular frequency is about
In an LC circuit that started with a charge \(q_0\), the energy is shared equally between the capacitor and the coil when the charge is
The displacement current between the plates of a charging capacitor is
A plane electromagnetic wave has an electric amplitude of \(150\,\text{V/m}\). Its magnetic amplitude is
Light falls on a mirror and is reflected straight back. Compared with the same light absorbed by a black surface, the pressure on the mirror is
An electromagnetic wave of frequency \(6\times10^{14}\,\text{Hz}\) has a wavelength of