$A$ $PN$ junction diode is used as:

Which of the following circuits provides full-wave rectification of an $A.C.$ input?

$A$ bridge rectifier is shown in the figure. Alternating input is given across $A$ and $C$. If the output is taken across $BD$,then it is

$A$ diode detector is used to detect an amplitude modulated wave of $60\%$ modulation by using a condenser of capacity $250\, pF$ in parallel with a load resistance $100\, k\Omega$. Find the maximum modulated frequency which could be detected by it.

$A$ sinusoidal voltage of peak value $200\,V$ is connected to a diode and resistor $R$ in the circuit shown,so that half-wave rectification occurs. If the forward resistance of the diode is negligible compared to $R$,the rms value of voltage across $R$ is approximately (in volt):

Which is the correct diagram of a half-wave rectifier?