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

For what value of the resistor $X$ will the equivalent resistance of the two circuits shown be the same?

Two batteries $V_1$, and $V_2$ are connected to three resistors as shown below.

If $V_1=2 \mathrm{V}$ and $V_2=0 \mathrm{V}$, the current $I=3 \mathrm{mA}$. If $V_1=0 \mathrm{V}$ and $V_2=4 \mathrm{V},$ the current $I=4 \mathrm{mA}$. Now if $V_1=10 \mathrm{V}$ and $V_2=10 \mathrm{V},$ the current $I$ will be

A steady current $I$ flows through a wire of radius $r$, length $L$ and resistivity $\mathrm{\rho }$. The current produces heat in the wire. The rate of heat loss in a wire is proportional its surface area. The steady temperature of the wire is independent of

Consider the circuit shown in the figure below:

All the resistors are identical. The ratio $\frac{I}{I^{\text{'}}}$ is

A current of $0.1 \mathrm{A}$ flows through a $25 \mathrm{\Omega }$ resistor represented by the circuit diagram. The current in the $80 \mathrm{\Omega }$ resistor is

A light bulb of resistance $R=16 \mathrm{\Omega }$ is attached in series with an infinite resistor network with identical resistances as shown below. A $10 \mathrm{V}$ battery derives a current in the circuit. What should be the value of $r$ such that the bulb dissipates about $1 \mathrm{W}$ of power?

A bird sitting on a single high tension wire does not get electrocuted, because

Two rods of copper and iron with the same cross sectional area are joined at $S$ and a steady current $I$ flows through the rods as shown in the figure.

Choose the most appropriate representation of charges accumulated near the junction $S$.