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Syllabus

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

What are the properties of

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

the answer is 2.0

ans me as fast as possible

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

A charge Q is distributed over a metal sphere of radius R.What is the electric field and potential at the centre?

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??

Draw suitable graph to show variation of photoelectric current with collector plate potential for:

a) fixed frequency but different intensities i1i2i3 of radiation

b) fixed intensity but different frequencies v1v2v3 of radiation.

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?

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.

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

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.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?

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

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

Name the physical quantity whose SI unit is Newton Coulomb

^{-1}.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.

What is nature of symmetry of a dipole field?

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

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 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..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

^{}bar = 3x i cap + 4j cap N/c pierces the gaussian surface cube .what is electric flux through right surface?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?

How much work is done in moving a 500 micro coulomb charge between two points on an equipotential surface?

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 potential difference of 1200 V is established between two parallel plates of a capacitor. The plates of the capacitor are at a distance of 2cm apart. An electron is released from the negative plate at the same instant a proton is released from the positive end. How does the following:

a) velocity

b) Energy compare when they strike the opposite plates.

c) How far from the positive plate will the pass each other?

ANS: a) 42.84, b) equal, c)2.7cm

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 charged metal spheres of radii R and 2R temporarily placed in contact and then separated. At the surface of each, which sphere has the greater value of the following: (a) charge, (b) charge density, (c) potential, (d) 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

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

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

explain the ans also

lenz law is consequence of the law of conservation of

charge,momentum, mass or energy

plz answer me xperts

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

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.

(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 ?

explain the working of VAN DE GRAFF GENERATOR?

Ans 2500V;1.1*10^-5C.

Define dielectric constant in term of capacitance

Two point charges of +3x10

^{-8}C and -2x10^{-8}C are located 15 cm apart in air. Find at what point on the line joining these charges the electric potential is zero. Take potential at infinity to be zero.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 isQ.15. Figure shows a portion of a circuit. Value of current through ${R}_{1}$ is

(1) $\frac{8}{5}A$

(2) 2 A

(3) 1 A

(4) 3 A

show that there is always a loss of energy when two capacitors charged to different potentials share charge

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?

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??

^{6}/r^{2}cm^{-2}. Calculate the energy of the system in the external field.Draw an equipotential surface in a uniform electric field...

Sr.NoCapacitorArea of platesSeparationbetween the plates

Medium betweenthe plates

1PADMedium of Er ---42Q2AD/2air3R2ADMedium ofEx =21) at the surface of sphere

2)at the centre of the sphere

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

_{o}A/d. Explain why the capacitance of the parallel plate capacitor decreases on increasing the separation between the plates.i) positive ii) negative?

Solve this :$64.\mathrm{Figure}\mathrm{shows}\mathrm{two}\mathrm{shells}\mathrm{of}\mathrm{radii}\mathrm{R}\mathrm{and}2\mathrm{R}.\mathrm{The}\mathrm{inner}\mathrm{shell}(\mathrm{centre}\mathrm{at}\mathrm{A})\mathrm{is}\mathrm{nonconducting}\mathrm{and}\mathrm{uniformly}\mathrm{charged}\mathrm{with}\mathrm{charge}\mathrm{Q}\mathrm{while}\mathrm{the}\mathrm{outer}\mathrm{shell}(\mathrm{centre}\mathrm{at}\mathrm{B})\mathrm{is}\mathrm{conducting}\mathrm{and}\mathrm{uncharged}.\mathrm{The}\mathrm{potential}\mathrm{at}\mathrm{the}\mathrm{point}\mathrm{B}\mathrm{is}:\phantom{\rule{0ex}{0ex}}\left(\mathrm{a}\right)\mathrm{zero}\left(\mathrm{b}\right)\frac{\mathrm{KQ}}{\mathrm{R}}\left(\mathrm{c}\right)\frac{\mathrm{KQ}}{\mathrm{x}}\left(\mathrm{d}\right)\mathrm{None}\mathrm{of}\mathrm{these}$

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

Ans 100V,60V

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

answer soon pls

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

i) capacitance 1uF

ii)capacitance 2uF

iii)capacitance 3uF

iv)capacitance 1uF or 2uF or 3uF

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

(b) V' - V/V

(c) V' - V/ V'

(d) V - V'/V'

^{2},of an air capacitor be kept so that its capacitance is same as of conducting sphere of radiusa=0.5 m?with (a) a = 1 and b = 0 (b) a = 0 and b = 1 (c) a = - root 2 and b = 1 (d) a = - 2 and b = 0 (e) a = - 2 and b = 1 . No links , please give a detailed explainatioin , okax + byThe 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.