Embibe Experts Solutions for Chapter: Current Electricity, Exercise 1: Assam CEE 2016

A resistor develops $800 \mathrm{J}$ of thermal energy in $20 \mathrm{s}$ when a current of $4 \mathrm{A}$ is passed through it. If the current is increased from $4 \text{A}$ to $8 \mathrm{A}$, what will be the  energy developed in $20 \mathrm{s}$ ?

What is the charge on the capacitor in the circuit shown below?

Solar energy of $200 {\mathrm{Wm}}^{-2}$ is incident on a horizontal surface. If $20\%$ of this energy can be converted into useful electrical energy, the area needed to supply $8 \mathrm{kW}$ energy is

A potential difference of $5 \mathrm{V}$ is applied across a conductor of length $0.1 \mathrm{m}$. If the electron mobility is $5\times {10}^{-6}{ \mathrm{m}}^2{\mathrm{v}}^{-1}{\mathrm{s}}^{-1}$ then the drift velocity of electron is

A galvanometer has a coil of resistance $5 \mathrm{\Omega }$ and requires $15 \mathrm{mA}$ for full-scale deflection. The shunt resistance needed to convert the galvanometer into an ammeter of the range $0-1 \mathrm{A}$ is

The potential difference through the $3 \mathrm{\Omega }$ resistor shown in the figure is

A battery of e.m.f $12 \mathrm{V}$ and internal resistance $0.5 \mathrm{\Omega }$ is charged by a battery charger which supplies a $132 \mathrm{V}$ d.c. supply using a series resistance of $11.5 \mathrm{\Omega }$. What is the terminal voltage of the battery during charging?

A heating coil of resistance $100 \mathrm{\Omega }$ takes $100 \mathrm{s}$ to boil certain amount of water. If a similar heating coil is connected in series with the heating coil, then the time required to boil the water is $t_{\mathrm{s}}$, while $t_{\mathrm{p}}$ time is required to boil the same amount of water if the coils are connected in parallel. What will be $\frac{t_{\mathrm{s}}}{t_{\mathrm{p}}}$?