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Physics Exam Prep: Key Questions

This document contains 12 short questions and 5 long questions related to electricity concepts. Some of the key concepts covered include: defining electric flux and its unit; electric intensity and its SI unit; electric polarization; whether electrons move to regions of high or low potential; why electric field lines never cross; defining KWH and its relation to MJ; how the electric field and potential change when following an electric field line due to a positive point charge; why the electric field is zero inside a uniformly charged rubber balloon; why capacitance increases when a dielectric is inserted between capacitor plates; and defining electric flux and calculating it through a closed surface enclosing a charge.

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Mian Ejaz
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103 views1 page

Physics Exam Prep: Key Questions

This document contains 12 short questions and 5 long questions related to electricity concepts. Some of the key concepts covered include: defining electric flux and its unit; electric intensity and its SI unit; electric polarization; whether electrons move to regions of high or low potential; why electric field lines never cross; defining KWH and its relation to MJ; how the electric field and potential change when following an electric field line due to a positive point charge; why the electric field is zero inside a uniformly charged rubber balloon; why capacitance increases when a dielectric is inserted between capacitor plates; and defining electric flux and calculating it through a closed surface enclosing a charge.

Uploaded by

Mian Ejaz
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Chapter 12

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important short questions

Define electric flux and gives its unit.


Define electric intensity and give its SI unit.
What you meant by electric polarization?
Do electrons tend to go to region of high potential or of low potential?
Electric lines of forces never cross. Why?
Define KWH and show that 1kwh=3.5MJ?
Suppose that you follow an electric field line due to a positive point charge .do electric field and
electric potential increase or decrease.
Why is E zero inside a charged rubber balloon where charge is distributed uniformly over its
surface?
Electrons tend to go to region of high potential or low potential. Explain
Define the dielectric constant of an insulator and mention its unit.
Show that 1ev=1.610-19 J
Why does capacitance of a capacitor increase when a dielectric material is inserted between its
plates?

Important long questions


1. Define electric flux .calculate the electric flux through a closed surface enclosing a
charge q at its centre?
2. Describe Millikans method to determine the charge on an electron?
3. State gausss law .find electric intensity between two oppositely charged plates?
Determine the electric intensity due to an infinite sheet of charge?
4. Define energy density. Calculate the energy stored in a charged capacitor in an electric
field.
5. Define absolute potential and potential difference .derive an expression for absolute
potential at a potential at a point due to a point charge?

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