K K Sharma Solutions for Chapter: Current Electricity, Exercise 1: TOPICWISE QUESTIONS

The potential at points $B$, $C$ and $D$ in the following circuit will be

Study the circuit given below. The galvanometer shows no deflection. What is the value of resistance $X$?

Three identical batteries, each of emf $4 \mathrm{V}$ and negligible internal resistance, are connected as shown in the figure below. The potential difference between the points $A$ and $G\left(V_{\mathrm{A}}-V_{\mathrm{G}}\right)$ is,

In the following circuit diagram, the galvanometer reading is zero. If the internal resistance of cells is negligible, then the value of $X$ will be

When the key is pressed at time $t=0$, then which of the following statements about current $i$ in the resistor $AB$ of the given circuit is true?

A resistor $R$ and a capacitor of capacitance $2 \mathrm{\mu F}$ in series are connected through a switch to $200 \mathrm{V}$ direct supply. Across the capacitor is a neon bulb that lights up at $120 \mathrm{V}$. Calculate the value of $R$ to make the bulb light up $5 \mathrm{s}$ after the switch has been closed $\left({\log }_{10}2.5=0.4\right)$.

Combination of two identical capacitors, a resistor $R$ and a DC voltage source of voltage $6 \mathrm{V}$ is used in an experiment on the $\left(CR\right)$ circuit. It is found that for a parallel combination of the capacitor, the time in which the voltage of the fully charged combination reduces to half its original voltage is $10 \mathrm{s}$. For series combination, the time needed for reducing the voltage of the fully charged series combination by half is 

The figure shows an experimental plot for discharging of a capacitor in an $RC$ circuit. The time constant $\tau$ of this circuit lies between,