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Syllabus

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

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

What are the properties of

?Electric Lines of ForceWhat 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.

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??

Plzz answr fast

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. which combination of four identical capacitors (of all possible combinations) has maximum capa

citance? if these combinations are connected to a constant P.d., which combination store minimum energy?

2. can negative ions be accelerated using Van de Graaff generator? why?

3. On which principle ink jet printing and xerox copying machine works?

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.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 $4\times {10}^{15}Hzto8\times {10}^{15}Hz?\phantom{\rule{0ex}{0ex}}Givenh=6.4\times {10}^{-34}J-s,e=1.6\times {10}^{-19}Candc=3\times {10}^{8}m{s}^{-1}$

Charge q is uniformly distributed over a thin half ring of radius R .The electric field at the centre of the ring is?rn

Potential due to a charge

rnrnq at its own location is not defined – it is infinite. how? rn

rnWHAT ARE THE PROPERTIES OF EQUIPOTENTIAL SURFACES ?????????

a)volt c)newton/coulomb

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

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.

_{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.

a) C/10 b) C/9 c) 9C d) 10C

explain the ans also

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.

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..define equivalent capacitance

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

43.A particle is thrown with kinetic energy k straight up a rough inclined plane of inclination $\alpha $ and coefficient of friction $\mu $. The work done against friction before the particle comes to rest is$\left(1\right)\frac{k\mu sin\alpha}{\mathrm{cos}\alpha +\mu \mathrm{sin}\alpha}\left(2\right)\frac{k\mu \mathrm{cos}\alpha}{\mathrm{cos}\alpha +\mu \mathrm{sin}\alpha}\phantom{\rule{0ex}{0ex}}\left(3\right)\frac{k\mu sin\alpha}{\mathrm{sin}\alpha +\mu \mathrm{cos}\alpha}\left(4\right)\frac{k\mu cos\alpha}{\mathrm{sin}\alpha +\mu cos\alpha}$

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

(Answer is (2))

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.

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

Q. A particle moves in x-y plane with a velocity $\overrightarrow{v}=2y\hat{i}+4\hat{j}$ Equation of the path followed by the particle is

$1.x=\sqrt{y}\phantom{\rule{0ex}{0ex}}2.y=\sqrt{x}\phantom{\rule{0ex}{0ex}}3.4x={y}^{2}\phantom{\rule{0ex}{0ex}}4.4y={x}^{2}$

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

Q.Choose the incorrect statement(1) the potential energy per unit positive charge in an electric field at some point is called the electric potential.

(2) the work required to be done to move a point charge from one point to another in an electric field depends on the position of the points

(3) the potential energy of the system will increase if a positive charge is moved against of Coulombian force.

(4) the value of fundamental charge is not equivalent to the electronic charge.

lenz law is consequence of the law of conservation of

charge,momentum, mass or energy

plz answer me xperts

explain the concept of electric potential energy. Derive an expression for potential energy of a system of two point charges .Generalise the expression for N discrete charges.

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. ?

what is impedance?

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.

Q.12. For circuit shown in figure, the current must not exceed

(1) 1 mA

(2) 2 mA

(3) 5 mA

(4) 10 mA

explain the working of VAN DE GRAFF GENERATOR?

electric succeptibility

or

electric permittivity

pls explain?

Define dielectric constant in term of capacitance

to determine resistance per cm of a given wire by plotting a graph of potential difference versus current

1) at the surface of sphere

2)at the centre of the sphere

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?

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 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) 1/4 B) 4 C) 2 D) 1/2

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 a conductor an equipotential volume?

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

what is the derivation for vann de graff generator?

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.

Q. The potential on the hollow sphere of radius 1 m is 100 volt. The potential at 1/4 m from the centre of sphere is :

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?

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

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?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

Three charges, each equal to +2C are placed at the corners of an equilateral triangle. If the force between any two charges be F, then what will be the net force on either Chargedraw schematically an equipotential surface of a uniform electrostatic field along x-axis.

answer soon pls

39. A light cylindrical vessel is kept on a horizontal surface. Its base area is A. A hole of cross sectional area $\frac{A}{4}$ is made on side wall just at its bottom. Minimum coefficient of friction such that it does not

Slide due to impact force of emerging liquid is.

$\left(1\right)\mu =\frac{1}{4}\left(2\right)\mu =4\left(3\right)\mu =\frac{1}{2}\left(4\right)\mu =\frac{1}{8}$

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

(b) V' - V/V

(c) V' - V/ V'

(d) V - V'/V'

Four rigid rods AB, BC CD and DA each of linear mass density $\lambda $ and length a are rigidly to a square frame. This is placed in an XYZ space as shown in the figure. such that it can freely rotate about an Axis kk' (parallel to z-axis) The plane ABCD is on y-z plane. The rods AB and CD are carrying charges of linear charge density p and (- p)respectively. An electric field is existing in the space, which, is $\overline{)E}={\overline{)E}}_{0}\hat{j}$. If the wire frame is rotated by a small angle $\u25b3\mathrm{\theta}$ about the kk' axis and releaed . Find time in second required by the frame ABCD to regain its original position for the first time.

$\left(\mathrm{\lambda}=1\mathrm{kg}/\mathrm{m},\mathrm{a}=2\mathrm{m},\mathrm{p}=1/3\mathrm{C}/\mathrm{m},{\mathrm{E}}_{0}={\mathrm{\pi}}^{2}\mathrm{N}/\mathrm{C}\right)$

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.