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Syllabus

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

When a dielectric slab is placed in a uniform electric field (between a capacitor) say E

_{o}, the extreme faces of the dielectric slab get induced and the face near the positive plate of a capacitor gets negatively charged, the face near the other plate gets positively charged, the in between atoms are neutral. Okay, then the electric field inside the dielectric is E=E_{o}-E_{p}. But the induced charges on the extreme faces, will they not change the electric field between the corresponding plate and faces? I mean my sir said that the electric field between the two faces and the plates will remain E_{o}. How is this possible? Will the induced charges on the faces not slightly change the electric field?What are the properties of

?Electric Lines of ForceWhat is Ohm's law in vector form.........???

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.

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

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??

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?

Plzz answr fast

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?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.

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

_{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.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.

Q. The following graph shows the variation of charge Q with voltage V for two capacitors K and L. In

which capacitor is more electrostatic energy stored?

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..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

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

.A square of side a has charge q at each of its corner.Calculate the i) electric potential and ii) electric field intensity due to these charges at the center of the square.

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.

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

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

a spherical shell of radius 'a' with charge Q is expanded to radius 'b' . find the work done by electrical force in the process?

in this ques.why we use the relation w=12 VQ.....instead of W=VQ?

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

lenz law is consequence of the law of conservation of

charge,momentum, mass or energy

plz answer me xperts

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. ?

_{0 }at the centre of the squareTwo 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.

a)volt c)newton/coulomb

b)joule/coulomb d)newton-metre/coulomb

explain the working of VAN DE GRAFF GENERATOR?

In each of these metals is exposed to radiations of wavelength 300mm, which of them will not emit photo electrons and why?

OR

By how much would the stopping potential for a given photosensitive surface go up if the frequency of the incident radiations were to be increased from $4\times {10}^{15}Hzto8\times {10}^{15}Hz?\phantom{\rule{0ex}{0ex}}Givenh=6.4\times {10}^{-34}J-s,e=1.6\times {10}^{-19}Candc=3\times {10}^{8}m{s}^{-1}$

Define dielectric constant in term of capacitance

define equivalent capacitance

(Answer is (2))

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?

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 isa thin metal sheet is placed in the middle of a parallel plate capacitor what will be the effect on capacitance?

show 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??

_{0}E^{2}Ad where A is the area of each plate and d is the seperation between each plate.How will the energy stored in a fully charged capacitor change when the seperationbetween the plates is doubled and a dielectric medium of dielectric constant 4 is introduced between the plates ?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.

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?

Two capacitors with capacity C1 and C2 are charged to potential V1 and V2 respectively and then connected in parallel. Calculate the common potential across the combination, the charge on each capacitor, the electrostatic energy stored in the system and the change in the electrostatic energy from its initial value.

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

A. 2√(mgd+qE/m)

B. √((qE/md-g)l)

C. √((qE/md+g)l)

d. √(2(mgd-qE/m ))

i) positive ii) negative?

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?(1) 4.5 mJ

(2) 9 mJ

(3) 45 mJ

(4) 90 mJ

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

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?

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

answer soon pls

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?(i) charge on plates

(ii) electric field intensity between the plates ?

(iii) capacitance of the capacitor. justify your answer in each case.

(a) V' - V/V' +V

(b) V' - V/V

(c) V' - V/ V'

(d) V - V'/V'

ii) also state in each case now if a dielectric slab with k=A fills the entire space.

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.