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Syllabus

how does the angle of dip vary from equator to poles?

Q. E=5x

^{2}i. the potential difference between A(x=0) m and B(x=4 m), V_{A}-V_{B}is(1) -320 (2) 320 V

(3) (-320/3)V (4) (320/3)V

What are the properties of

?Electric Lines of Forcewhat is the electric flux

a) through curved surface area

b)through flat surface

What is Ohm's law in vector form.........???

derive an expression for the total work done in rotating an electric dipole through an angle theta in a uniform electric field.

A nuclear charge(Ze) is non uniformly distributed within a nucleus of Radius R .The charge density rho(r) is dependent only on the radial distance r from the centre of the nucleus as shown in the fig.The electric field is only along the radial direction.Q1=FOr a =0,the value of d would be?Ans=3(Ze)/pie *R^{3}Q2=Show that at r=R the electric field is independent of a?Two capacitors C1 and C2 are charged to potential V1 and V2 resp. and then connected in parallel. Calculate common potential, charge on each capacitor and energy in the system after connection??

Please explain about the sign in answer

Find the expression for the capacitance of a parallel plate capacitor of area A and plate separation d if

i) a dielectric slab of thickness t, and

ii) a metllic slab of thicknes t

(where t<d) are introduced one by one between the platesof the capacitor. In which case would the capacitance be more and why?

1. do these sheets represents equipotential surfaces? Justify your answer.

2. find the amount of work done by an external agency in taking a charge of +2?c from sheet three to sheet two.

An electic dipole of length 2cm is placed with its axis making an angle 60 degree with respect to a uniform electric field of 10

^{5}N/C. If it experiences a torque of 13.856 Nm, calculate the- magnitude of the charge on the dipole & PE of the dipole.Charge q is uniformly distributed over a thin half ring of radius R .The electric field at the centre of the ring is?Two point charges of +16 micro coulomb and -9 micro coulomb are placed 8cm apart in air. Determine the position of the point at which the resultant field is zero.

WHAT ARE THE PROPERTIES OF EQUIPOTENTIAL SURFACES ?????????

A parallel plate capacitor is charged by a battery. After sometime the battery is disconnected and a dielectric slab of dielectric constant K is inserted in between the plates. How would i) The capacitance ii) The electric field between the plates and iii) The energy stored in the capacitor be affected? Give reasons with necessary equations.

Q7. In the given figure three point charges are situated at the corners of an equilateral triangle of side 10 cm. Calculate the resultant force on the change at B. What is its direction?

_{1 },q_{2,}q_{3}are in line at equal distances q_{2 }and q_{3}are in sign .Find the magnitude and sign of q_{1 },if the net force on q_{3}is zero.A) 1/4 B) 4 C) 2 D) 1/2

ChargeQ is distributed over two concentric hollow spheres of radii R1 and R2 (R2>R1) such that the surface charge densities areequal. Find the electric potential at the common centre.

An electric dipole is held in a uniform electric field.

a) Show that the net force acting on it is zero.

b) The dipole is aligned parallel to the field.Find the work done in rotating through angle of 180 degree

A spherical conducting shell of inner radius r1 and outer radius r2 has a charge Q. A charge q is placed at the centre of the cell.

(a) What is the surface charge density on the (i) inner surface (ii) outer surface of the shell.

(b) Write the expression for electric field at a point x r2 from the centre of the shell.

show that the electric field is always directed perpendicular to an equi-potential surface.

Calculate the amount of work done in rotating a dipole, of dipole moment 3 x 10

^{-8}Cm, from its position of stable equilibrium to the position of unstable equilibrium of uniform electric field 10^{4}N/C..Name the physical quantity whose SI unit is Newton Coulomb

^{-1}.Q1.)CALCULATE THE WORK DONE TO DISSOSIATE THE SYSTEM OF THREE CHARGES PLACED ON THE VERTICES OF THE TRIANGLE ABC

HERE q=1.6 * 10

^{-10 }Call side of 10cm ,A=q ,B=2q,C=-4q

capacitance C2 is charged to a potential difference V2 The capacitors are now disconnected

from their respective charging batteries and connected in parallel to each other. (a) Find the

total energy stored in the two capacitors before they are connected.

(b) Find the total energy stored in the parallel combination of the two capacitors.

(c) Explain the reason for the difference of energy in parallel combination in comparison to

the total energy before they are connected.

Draw 3 equipotential surfaces corresponding to a field that uniformly increases in magnitude but remains constant along z direction.

how are these surfaces different from that of a constant electric field along z direction?

Two point charges 4 micro coulomb & -2 micro coulomb are seperated by a distance of 1m in air. At what point of line joining the charges is the electric potential zero?

two concentric metallic spherical shells of radii R and 2R are given charges Q1 and Q2 respectively .the surface charge densities on the outer surfaces of the shells are equal .determine the ratio Q1:Q2

15. Four charges are placed at the corners of a square of side a.

Work done by external agent in carrying an electron from point O to O' is

$\left(1\right)\frac{-4\mathrm{ekQ}}{\mathrm{a}}\left(\sqrt{5}-2\sqrt{2}\right)\left(2\right)\frac{4\mathrm{ekQ}}{\mathrm{a}}\left(\sqrt{5}-2\sqrt{2}\right)\phantom{\rule{0ex}{0ex}}\left(3\right)\frac{4\mathrm{ekQ}}{\mathrm{a}}\left(\sqrt{5}+2\sqrt{2}\right)\left(4\right)\frac{-4\mathrm{ekQ}}{\mathrm{a}}\left(1+\frac{1}{\sqrt{5}}-\sqrt{2}\right)$

Derive an expression for the energy stored in parallel plate capacitor with air as the medium between its plates . Air is now re placed by dielectric medium of dielectric constants k. How does it charges the total energy of the capacitor if

a ) the capacitor remains connected to the same battery .

b ) the capacitor is disconnected from the battery.

Two electrons are moving towards each other,each with a velocity of 10

^{6}m/s.What will be losest distance of approach between them?Three identical capacitors C

_{1}, C_{2}and C_{3}of capacitance 6 μF each are connected to a 12 V battery as shown.Find

(i) charge on each capacitor

(ii) equivalent capacitance of the network

(iii) energy stored in the network of capacitors

Derivation of electric potential energy of a system of two point charges in the absence of external electric field

lenz law is consequence of the law of conservation of

charge,momentum, mass or energy

plz answer me xperts

Two charges of 2.4 micro C and - 2.4 micro C are at a distance 2.5 * 10 ^ -3 m apart from each other . Determine the magnitude of the electric field in the broad side on position at a distance of 0.30 m from this dipole . If the dipole be rotated through 90 degree . then what will be the intensity of the field.??

A 600 pF capacitor is charged by a 200V supply. It is then disconnected from the supply and is connected

to another uncharged 600 pF capacitor. How much electrostatic energy is lost in the process. ?

Two capacitors, of capacitance 3 micro farad and 6 micro farad are charged to potentials of 2V and 5V respectively. These two charged capacitors are connected in parallel . Find the charge across each of the two capacitors now.

explain the working of VAN DE GRAFF GENERATOR?

_{0 }at the centre of the squareDefine dielectric constant in term of capacitance

If the potential in the region of space around the point(-1m,2m,3m) is given by V=(10x

^{2}+5y^{2}- 3z^{2}), calculate the three componenets of electric field at this point.A 4 micro farad capacitor charged by 200 volt supply. It is then dissconnected from the supply and is connected to anothe uncharged 2 micro farad capacitor. How much electrostatic energy of first capacitor is lost in the form of heat or e. m radiations?

derivation for energy stored in a capacitor?

Plzz answr fast

a non conducting ring of radius 0.5 m carries a total charge of 1.11*10

^{-10}C distributed non uniformly on it's circumference producing electric field E vector everywhere in the space . the value of the line integral ∫ -E. dl ( llower limit =infinity , upper limit = 0) (=0 being at the centre of the ring ) in volts isshow that there is always a loss of energy when two capacitors charged to different potentials share charge

the circuit is in series with a at one end and the capacitors connecetd in series

why is electrostatic potential constant throughout the volume of the conductor and has the same value(as inside) on its surface??

A 10 micro faran capacitor is charged by a 30V dc supply & then connected across an uncharged capacitor of 50 micro faran. Calculate the(1) final potential difference across the combination & the (2)initial & final energies. How will you account for the difference in energies?

Draw an equipotential surface in a uniform electric field...

Electric potential in an electric field is given by v=K/r ( K=const). If the posiion vector r = 2i + 3j + 6k, the electric field is given by

A) ( 2i + 3j + 6k) / 243

B) (2i + 3j + 6k) / 343

C) (3i + 2j + 6k) / 243

D) (6i + 2j + 6k) 343

Plz do all the proper.

derivation of electric potential at a point on axial line of an electric dipole

(i) Calculate the electrostatic potential energy of the system, assuming the zero of the potential energy

to be at infinity.

(ii) Draw an equipotential surface of the system.

(iii) How much work is required to separate the two charges infinitely away from each other ?

i) positive ii) negative?

A) in series. B) in parallel. C) in series parallel combination. D) none of the above

2 identical parallel plate capacitors connected to a battery with the switch 's' closed . the switch 's' is now open and the free space between the plate of the capacitor is filled with a dielectric of k=3. Find the ratio of total energy stored in both capacitors before and after the introduction of the dielectric

i) capacitance 1uF

ii)capacitance 2uF

iii)capacitance 3uF

iv)capacitance 1uF or 2uF or 3uF

draw schematically an equipotential surface of a uniform electrostatic field along x-axis.

answer soon pls

Two substances of densities P

_{1}and P_{2 }are mixed in equal volume and the relative density of mixture is 4. When they are mixed in equal masses, the relative density of the mixture is 3. The values of P_{1 }and P_{2 }are........^{2},of an air capacitor be kept so that its capacitance is same as of conducting sphere of radiusa=0.5 m?(a) V' - V/V' +V

(b) V' - V/V

(c) V' - V/ V'

(d) V - V'/V'

Two point charges 2uC and -2uC are placed at points A and B 6 cm apart .

(1) Draw the equipotential surfaces of the system.

(2) Why do equipotential surface get closer to each other near the point charges?

Q.33. Find the value of k if potential at O is zero.

The half –life of a radioactive substance is 30 s. Calculate:(i ) the decay constant, and(ii) Time taken by the sample to decay 3/4 of its initial value.Q.L. Why is an insulator sometimes called a dielectric? What is the main difference between free and bound charge? Generally one of the two plates of a Capacitor System is earthed, why? Derive the expression for the energy stored in a charged capacitor.