Recent questions and answers in Electric charges and fields

If the distance between two charge is reduced to half then the electrical force between them will become

answered Mar 21, 2019 by meena.clay6

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If a unit charge is rotated around a charge q in a circular path of radius r, then the work done will be

answered Mar 21, 2019 by meena.clay6

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Torque acting on a electric dipole in a uniform electric fiels $\hat E$

answered Mar 20, 2019 by meena.clay6

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Coulombs states that Force between charges is

answered Mar 20, 2019 by meena.clay6

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Expression for electric field at any point on axial line of electric dipole is

answered Mar 20, 2019 by meena.clay6

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Net flux through closed surface S is

answered Mar 20, 2019 by meena.clay6

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Apply Gauss's theorem to show that for a spherical shell, the electric field inside the shell vanish

answered Jun 2, 2017 by pady_1

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Apply Gauss's theorem to show that for a spherical shell, the electric field inside the shell vanish

answered Jun 2, 2017 by pady_1

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Apply Gauss's theorem to show that for a spherical shell, the electric field inside the shell vanish

answered Jun 2, 2017 by pady_1

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Apply Gauss's theorem to calculate the electric field of a thin infinitely long straight line

answered Jun 1, 2017 by pady_1

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Deduce coulomb's law from Gauss theorem  

answered Jun 1, 2017 by pady_1

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Deduce coulomb's law from Gauss theorem  

answered Jun 1, 2017 by pady_1

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Deduce coulomb's law from Gauss theorem  

answered Jun 1, 2017 by pady_1

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State and prove Gauss theorem 

answered Jun 1, 2017 by pady_1

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Derive an expression for the electric field at any point on the equatorial line of an electric dipol

answered May 31, 2017 by pady_1

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Derive an expression for the electric field at any point on the equatorial line of an electric dipol

answered May 31, 2017 by pady_1

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Derive an expression for the electric field at any point on the equatorial line of an electric dipol

answered May 31, 2017 by pady_1

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Derive an expression for the electric field at any point on the axial line of an electric dipole&amp

answered May 31, 2017 by pady_1

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Derive an expression for the electric field at any point on the axial line of an electric dipole&nbs

answered May 31, 2017 by pady_1

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Derive an expression for torque acting on a electric dipole in a uniform 2 Dimensional electricfield

answered May 30, 2017 by pady_1

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characteristic of Electric Lines of Force

answered May 30, 2017 by pady_1

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Comparison of Electrostatic and Gravitational Force

answered May 30, 2017 by pady_1

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Define Coulumb’s Law

answered May 29, 2017 by pady_1

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Define Coulumb’s Law

answered May 29, 2017 by pady_1

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Define Coulumb’s Law

answered May 29, 2017 by pady_1

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Define coulomb? Force experienced by option 1 coulomb charge placed at a distance of 1 m from a similar charge is

answered May 29, 2017 by pady_1

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Define coulomb?

asked May 29, 2017 by pady_1

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The plates of a parallel plate capacitor have an area of $90\; cm^2$ each and are separated by $2.5\; mm$. The capacitor is charged by connecting it to a $400\; V$ supply.How much electrostatic energy is stored by the capacitor?

answered Jan 2, 2017 by meena.p

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Three capacitors of capacitances $2pF, 3pF$ and $4pF$ are connected in parallel. What is the total capacitance of the combination?

answered Jan 2, 2017 by meena.p

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(i) Find the magnitude and direction of current in $1 \Omega$ resistor in the given circuit . (ii) Two students X and Y perform an experiment on potentio meter separately using the circuit diagram shown below. Keeping other things unchanged (a) X increases the value of resistance R, (b) Y decrease the value of resistance S in the set up. How will these change affect the position of null point in each case and why ? (a) Use Kirchhoff's rules , calculate the current in the arm AC of the given circuit ? (b) On what principle does the meter bridge work ? Why are the metal strips used in the bridge ?

answered Jun 10, 2016 by meena.p

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Draw a ray diagram showing the geometry of formation of image of a point object situated on the principal axis and on the convex side of a spherical surface of radius of curvature R. Taking the rays as incident from a rarer medium of refractive index $n_1$ to a denser medium of refractive index $n_2$ derive the relation. $\large\frac{n_@}{v} -\frac{n_1}{u} = \frac{n_2-n_1}{R}$, Where symbols have their usual meaning ? (ii) Explain briefly how the focal length of a convex lens changes with increase in wave length of incident light . (iii) What happens to the focal length of convex lens when it is immersed in water ? Refractive index of the material of lens is greater than water .

answered Jun 10, 2016 by meena.p

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When a parallel beam of monochromatic source of light of wave length incident on a single slit of width, show how the diffraction pattern is formed at the screen by the interference of the wavelets from the slit.

answered Jun 9, 2016 by meena.p

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(a) Consider a beam of charged particles moving with varying speeds.Show how crossed electric and magnetic fields can be used to select charged particles of a particular velocity ? (b) Name another device / machine do and what are the functions of magnetic and electric fields in this machine ? Where do these exists in this machine ? Write about their natures .

answered Jun 9, 2016 by meena.p

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Express Biot-savart law in the vector form. (ii) Use it to obtain the expression for the magnetic field at an axial point, distance d from the center , of a circular coil of radius R carrying current I. (iii) Also , find the ratio of the magnitudes of the magnetic field of this coil at the center at an axial point for which $x= R\sqrt 3$

answered Jun 9, 2016 by meena.p

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During a thunderstorm the 'live' wire of the transmission line fell down on the ground from the poles in the street. A group of boys, who passed through,noticed it and some of them wanted to place the wire by the side. As they were approaching the wire and trying to lift the cable, Anuj noticed it and immediately pushed them away, thus preventing them from touching the live wire. During pushing some of them got hurt. Anuj took them to a doctor to get them medical aid. Based on the above paragraph, answer the following questions : (a) Write the two values which Anuj displayed during the incident. (b) Why is it that a bird can sit on a suspended 'live' wire without any harm whereas touching it on the ground can give a fatal shock ? (c) The electric power from a power plant is set up to a very high voltage before transmitting it to distant consumers. Explain, why.

answered Jun 9, 2016 by meena.p

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Derive an expression for the electric field intensity at a point on the equatorial line of an electric dipole moment $\overrightarrow{P}$ and length 2a. What is the direction of this field ?

answered Jun 9, 2016 by meena.p

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(i) Name the phenomenon on which the working of an optical fiber is based ? (ii) What are the necessary condition for this phenomenon to occur ?

answered Jun 9, 2016 by meena.p

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(i) For a glass prism $(\mu = \sqrt 3 )$ the angle of minimum deviation is equal to the angle of the prism. Calculate the angle of the prism . (ii) Draw ray diagram when incident ray falls normally on one of the two equal sides of a right angled isosceles prism having refractive index $\mu = \sqrt 3$

answered Jun 8, 2016 by meena.p

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(a)Define the term "intensity of radiation " in photon picture. (b) . plot a graph showing the variation of photo current vs collector potential for three different intensities $I_1 > I_2 > I_3$, two of which $(I_1$ and $I_2)$ have the same frequency v and the third has frequency $v_1 > v$ (c) Explain the nature of the curves on the basis of Einstein's equation .

answered Jun 8, 2016 by meena.p

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Draw a circuit diagram of a common emitter amplifier using n-p-n transistor . Derive an expression for the current gain $\beta _{ac}$

answered Jun 8, 2016 by meena.p

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Plot a graph showing the variation of binding energy per nucleon as a function of mass number. Which property of nuclear force explains the approximate constancy of binding energy in the range $30 < A < 170$ ? How does one explain the release of energy in both the processes of nuclear fission from the graph ?

answered Jun 8, 2016 by meena.p

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Plot a graph showing the variation of binding energy per nucleon as a function of mass number. Which property of nuclear force explains the approximate constancy of binding energy in the range $30 < A < 170$ ? How does one explain the release of energy in both the processes of nuclear fission from the graph ?

asked Jun 8, 2016 by meena.p

0 answers

Derive an expression for the axial magnetic field of a finite solenoid of length 2l and radius r carrying current I. Under what condition does the field become equivalent to that produced by a bar magnet ?

answered Jun 8, 2016 by meena.p

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