Embibe Experts Solutions for Chapter: Current Electricity, Exercise 1: VITEEE 2017

The electric resistance of a certain wire of iron is $R$. If its length and radius are both doubled, then

In the circuit shown, the cells $A$ and $B$ have negligible resistances for $V_{\mathrm{A}}=12\mathrm{ V,} R_1=500\mathrm{ \Omega }$ and $R=100\mathrm{ \Omega }$. The galvanometer $\left(\mathrm{G}\right)$ shows no deflection. The value of $V_{\mathrm{B}}$ is

Six identical conducting rods are joined as shown in the figure. Points $A$ and $D$ are maintained at ${200}^{\mathrm{ o}}\mathrm{C}$ and ${20}^{\mathrm{ o}}\mathrm{C}$, respectively. The temperature of junction $B$ will be

The current in the $1 \mathrm{\Omega }$ resistor shown in the circuit is,

The power dissipated in the circuit shown in the figure is $30 \mathrm{W}$. The value of $R$ is

Resistances $1 \mathrm{\Omega },\mathrm{ }2\mathrm{ }\mathrm{\Omega }$ and $3 \mathrm{\Omega }$ are connected to form a triangle. If a $1.5 \mathrm{V}$ cell of negligible internal resistance is connected across the $3 \mathrm{\Omega }$ resistor, the current flowing through this resistor will be

The figure below shows currents in a part of electric circuit. The current $i$ is

A potentiometer wire, $10 \mathrm{m}$ long, has a resistance of $40 \mathrm{\Omega }.$ It is connected in series with a resistance box and a $\mathrm{2 }\mathrm{V}$ storage cell. If the potential gradient along the wire should be $0.1 \mathrm{mV} {\mathrm{cm}}^{-1}$, the resistance unplugged in the box is