Embibe Experts Solutions for Chapter: Current Electricity, Exercise 2: Level 2

The current flowing in a copper voltmeter is $1.6 A$. The number of ${Cu}^{++}$ ions deposited at the cathode per minute is

The current flowing through a wire depends on time as $I=3t^2+2t+5.$ The charge flowing through the cross section of the wire in time from $t=0$ to $t=2 \mathrm{s}$ is

The drift velocity of electrons in a conducting medium is due to

A piece of copper and another of germanium are cooled from room temperature to $80 \mathrm{K}$. The resistance of...

An electric bulb of $500 \mathrm{W}$ at $100 \mathrm{V}$ is used in a circuit having a $200 \mathrm{V}$ supply. Calculate the resistance $R$ to be connected in series with the bulb so that the power delivered by the bulb is $500 \mathrm{W}$.

Two ideal batteries of emf $V_1$ and $V_2$ and three resistances $R_1, R_2$ and $R_3$ are connected as shown in the figure. The current in resistance $R_2$ would be non-zero, if

In the given figure, there is a circuit of potentiometer of length $AB=10 \mathrm{m}$. The resistance per unit length is $0.1 \mathrm{\Omega }$ per $\mathrm{cm}$. Across $AB$, a battery of emf $E$ and internal resistance $r$ is connected. The maximum value of emf measured by this potentiometer is:

In a potentiometer of $10$ wires, the balance point is obtained on the $6^{\text{th }}$ wire. To shift the balance point to $8^{\text{th }}$ wire, we should