Embibe Experts Solutions for Chapter: Current Electricity, Exercise 3: Exercise (Conceptual Questions)

Time constant of a series $R-C$ circuit is

A capacitor of 10 µF capacity is connected to 12V battery and a resistance. Calculate work done by battery to increase the potential of capacitor from 5 V to 5.1 V.

On increasing the temperature the specific resistance of a semiconductor 

Platinum and silicon are cooled after heating up to $25 °\mathrm{C}$ then 

Two wires $P$ and $Q$ made up of different materials have the same resistance at room temperature. When heated, the resistance of $P$ increases and that of $Q$ decreases. We conclude that:-

A conducting wire of Copper and Germanium are cooled from room temperature to temperature $80 \mathrm{K}$, then their resistance will

In semiconducting maerial the mobilities of electrons and holes are ${\mu }_e and {\mu }_h$ respectively. Which of the following is true :-

In the given transistor circuit, the base current is 35 $\mu$A. The value of R_B is ( $V_{AB}$ is assumed to be negligible)