List of top Physics Questions on Electronic devices asked in JEE Main

In a semiconductor p-n diode, the doping concentrations on p-side and n-side are \( 10^{15} \text{ atoms/cm}^3 \) and \( 10^{18} \text{ atoms/cm}^3 \), respectively. Which one of the following statements is true?

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: A diode under reverse-biased condition provides very small current which is nearly independent of voltage until a critical limit at which the current increases drastically.
Reason R: Below the critical voltage limit, only majority charge carriers flow which increases drastically above critical voltage.
choose the correct answer from the options given below:

Consider a circuit consisting of a capacitor (20 μF), resistor \((100 \Omega)\) and two identical diodes as shown in figure. The resistance of diode under forward biasing condition is 10 Ω. The time constant of the circuit is \(\alpha \times 10^{-3}\) s. The value of \(\alpha\) is ________.

A Zener diode of breakdown voltage 10V is used as a voltage regulator as shown in the figure. The current through the Zener diode is

Identify the logic operation performed by the given circuit.

Which of the following circuits is reverse-biased?