Embibe Experts Solutions for Chapter: Sample Paper 1, Exercise 1: Exercise

Draw equipotential surfaces for (i)an electric dipole and (ii) two identical positive charges placed near each other.

Three charges $–q, Q$ and $–q$ are placed at equal distances on a straight line. If the potential energy of the system of these charges is  zero, then what is the ratio $Q:q$?

(i) Obtain the expression for the electric field intensity due to a uniformly charged spherical shell of radius $R$ at a point distant $r$ from the centre of the shell outside it.
(ii) Draw a graph showing the variation of electric field intensity $E$ with $r$, for $r > R$ and $r < R$.

Explain the term drift velocity of electrons in a conductor. Hence, obtain the expression for the current through a conductor in terms of  drift velocity.

State the two Kirchhoff’s rules used in the analysis of electric circuits and explain them.

Derive the equation of the balanced state in a Wheatstone bridge using Kirchhoff’s laws.

Draw the graph showing intensity distribution of fringes with phase angle due to diffraction through a single slit. What is the width of the  central maximum in comparison to that of a secondary maximum?

Write two points of difference between an interference pattern and a diffraction pattern.