Embibe Experts Solutions for Chapter: Current Electricity, Exercise 1: Meghalaya-2018

State Kirchhoff’s voltage law.

The potential difference across a given wire is increased. What happens to the drift velocity of the free electrons?

The circuit shown in the figure below contains a battery $\mathrm{B}$, a rheostat $\mathrm{Rh}$ and identical lamps $\mathrm{P}$ and $\mathrm{Q}$. What will happen to the brightness of the lamps if the resistance through the rheostat is increased? Give reasons.

Find the current i in the circuit given below:

Given, forward resistance of the diode is $r_f=1 \mathrm{\Omega }$, $R=2 \mathrm{\Omega }$ and $V=10 volts$

Using an expression for drift velocity, show that the mobility of free electron is directly proportional to its relaxation time.

Why do we prefer potentiometer to compare e.m.fs of cells than a voltmeter?

Find $I$ in the following circuit :

[Assume negligible internal resistance of the cell.]

From the following circuit, using Kirchoff's rule, find the current that flows through the $8 \Omega$ resistor :