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Syllabus

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

10.Determine the potential difference across the plates of the capacitor C

_{1}of the network shown in the figure/(assume,E_{2}>E_{1})What are the properties of

?Electric Lines of Force^{0}with vertical,if the charge in pith ball is equal to 10^{-7}C.What is Ohm's law in vector form.........???

ii) Two identical capacitors of plate dimensions $l\times b$ and plate separation d have dielectric slabs filled in between the space of the plates as shown in the figure

Obtain the relation between dielectric constants K, K

_{1}and K_{2}.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??

Q.13. In the given circuit, with steady current, calculate

(a) the potential drop

(b) the charge and the

(c) energy stored in the capacitor in terms of V.

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?

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

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?The half â€“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.WHAT ARE THE PROPERTIES OF EQUIPOTENTIAL SURFACES ?????????

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.

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.27 small drop of mercury having the same radius collapse from 1 big drop find the ratio of capacitance of big drop to small drop??

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 pitch ball of mass 0.2g is hung by insulated thread between the plates of a capacitor of seperation 8cm. Find the potentia; difference between the plates to cause the thread to incline at an angle of 15 degree with the vertical, if the charge in the pitch ball is 10 to the power -7.

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..Q. Calculate the equivalent capacitance between points A and B in the circuit below .If a battery of 10 V is connected across A and B , calculate the charge drawn from the battery by the circuit .

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 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

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?

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

The followingshow the field lines of a single positive and negative charge respectively.

Give the signs of the potential differences.V_{P }- V_{Q} ; V_{B }- V_{A}Give the sign of the potential energy difference of a small negative charge between the points Q and P ; A and B.Give the sign of the work done by the field in moving a small positive charge from Q to P.Give the sign of the work done by an external agency in moving a small negative charge from B to A.Does the kinetic energy of a small negative charge increase or decrease in going from B to A.lenz law is consequence of the law of conservation of

charge,momentum, mass or energy

plz answer me xperts

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.

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. ?

show that the potential of a charged spherical conductor kept at the centre of a charged hollow spherical conductor is always greater than that of the hollow spherical conductor irrespective of the charge accumulated on it .

explain the working of VAN DE GRAFF GENERATOR?

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.

Define dielectric constant in term of capacitance

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

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) 0 C (b) 4 microC (c) 16 microC (d) 8 microC

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

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

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

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

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

A metal plate is introduced between the plates of a charged parallel plate capacitor. What is its effect on the capacitance of the capacitor?

i) positive ii) negative?

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

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 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) What are the signs of the two charges?

(2) Which of the two charges has a larger magnitude and why?

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.

Three circuits, each consisting of a switch 'S' and two capacitors, are initially charged, as shown in the figure. After the switch has been closed, in which circuit will the charge on the left-hand capacitor (i) increase, (ii) decrease and (iii) remains same ? Give reasons.

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

answer soon pls

plz explain what is electric polarisation vector . plz define the term electric susceptibility.

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

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.what is a transformer? what is its principle of working? why efficiency of a transformer is less than 100%? whya transformer cannot be used to step up or step down dc voltage?

State the laws of reflection & refraction of light. .