Embibe Experts Solutions for Chapter: Current Electricity, Exercise 1: Exercise 1

The reading of a high resistance voltmeter, when a cell is connected across it is $2.2 \mathrm{V}$. When the terminals of the cell are also connected to a resistance of $5 \mathrm{\Omega }$  as shown in the circuit, the voltmeter reading drops to $1.8 \mathrm{V}$. The internal resistance of the cell is:

In the circuit shown in the figure,

A voltmeter has a least count of $0.1 \mathrm{V}$and an ammeter has a least count of $0.1 \mathrm{A}$. The potential drop $V$ across a resistance is measured as $10.0 \mathrm{V}$ and current through it is measured as $1.0 \mathrm{A}$. Select the correct alternative.

Three ammeters $A, B$ and $C$ of resistances $R_A, R_B$ and $R_C,$ respectively, are joined as shown in the figure.

When some potential difference is applied across the terminals $T_1$ and $T_2,$ their readings are $I_A, I_B$ and $I_C,$ respectively, then

A battery of emf $E$ and internal resistance $r$ is connected across a resistance $R.$ Resistance $R$ can be adjusted to any zero. A graph is plotted between the current passing through the resistance $\left(I\right)$ and potential difference $\left(V\right)$ across it. Select the correct alternatives.

Which of the following statements are correct?

A cylindrical solid rod of length $L$ and radius $a$ is connected across a source of emf $V$ and negligible internal resistance as shown in the figure. The resistivity of the rod at point $P$ at a distance $x$ from the left end is given by $\rho =bx$ (where $b$ is a positive constant). The electric field at point $P$ is $\left(\frac{nV}{L^2}\right)x$. The value of $n$ is

In the arrangement shown in figure, find the potential difference $V_B-V_A$ (in $V$ ). (Take $V_0=55 \mathrm{V}$)