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Syllabus

what is the meaning of quantisation of charge?

20.A metallic sphere of radius 5 cm has a charge of 6 $\mu $C. The surface charge density is$\left(1\right)\frac{6}{\mathrm{\pi}}\times {10}^{2}\mu C/{m}^{2}\left(2\right)\frac{4}{\mathrm{\pi}}\times {10}^{2}C/{m}^{2}\phantom{\rule{0ex}{0ex}}\left(3\right)6\times {10}^{3}\mu C/{m}^{2}\left(4\right)4\times {10}^{3}C/{m}^{2}$

_{0}?Solve this:Two equal negative charges-q, are placed at point (0,a) and (0,-a) on y axis, one positive charge q at rest is left to move from point (2a,0). This charge will be :

(1) executive S.H.M. about the origin. (2) oscillate but not execute S.H.M.

(3) move towards origin and will become stationary (4) S.H.M. along x axis.

Difference between gravitational force and electrostatic force

Explain the formulae E = Sigma / Epsilon not.

E is the electric field vector.

Epsilon not is the specific inductive capacity or relative permittivity of vaccum.

Sigma = ? (doubt)

what is the dimensional formula of epsilon not?

^{6 }Nm^{2}/C.No links plsTwo similarly and equally charged identical metal spheres A and B repel each other with a force of 0.000002 N. A third identical sphere C is touched with A and then placed at the mid point between A nd B. What is the net electric force on C?

Calculate charge on

_{26}Fe^{56}nucleus ?Three point charges of +2 microcoulomb,-3 microcoulomb and -3 microcoulomb are kept at the vertices A,B and C respectively of an equilateral triangle of side 20 cm.What should be the sign and magnitude of the charge to be placed at the mid point(M) of side BC so that the charge at A remains in equilibrium?

Force exerted by a uniform electric field on an electron having mass m1 and proton of mass m2 are represented as F1 and F2 are related as

A charge q is placed at the center of the line joining two equal charges Q. Show that the system of three charges will be in equilibrium if q = -Q/4.

a) x direction

b) y- direction

c) at an angle of 45 degree from x axis

d) along perpendicular to the plane

derive an expression for potential energy of an electric dipole in a uniform electric field .

(i) inside the shell (ii) just outside the shell and (iii) 3.0 m from the centre of the shell.

[(i) 0 (ii) 2.88 × 10

^{4}NC^{–1}(iii) 200 NC^{–1}]An infinite number of charges each equal to q are placed along x axis at x=1 , x=2 , x=4, x=8 and so on . Find the electric field at the point where x=0 due to this setup of charges and what will be the electric field if inthe above setup the consecutive charges have opposite sign.?

what does q1+q2 =0 signify in electrostatics?

CAN THIS BE DONE LYK DIS------REPLY IN YES OR NO.

difference between uniform and non-uniform electric fields.... plzz if possible draw diagrams too..!

^{4 }m/s?a gas is heated through 1 degree celsius in a closed vessel. its pressure is increased by 0.4%.the initial temperature of the gas is ????

A charge "q" is placed at the centre of the cube of side "l". What is the electric flux passing through each face of the cube?

what is N=nNa

Pls provide chart for values of Sin, Cos, Tan and Cot for specific values from 30 degrees to 360 degrees.

Q. Two point charges separated by a certain distance in vacuum exerts an electrostatic force on each other of magnitude $4\times {10}^{-3}N.$ What will be the magnitude of force between the charges in a dielectric medium of k=2 while separated by same distance?

Â What is quantisation of charge?

what is the direction of electric field at the surface of a charged conductor having charge density Ïƒ < 0.

What are the limitations of Coulomb's Law ?

+500 µC. What is its electric dipole moment? Calculate the electric field due to the dipole at a point on the axis distant 0.2 m from the centre of the dipole.A pendulum bob of mass of 80 mg and carrying a charge of 2 X 10

^{-}^{8}C is at rest in a horizontal uniform electric field of 20,000 V/m. Find the tension in the thread of the pendulum and the angle it makes with the vertical.Take( g = 9.8ms

^{-2})Four charges, each equal to Q are placed at the 4 corners of a square and a charge q is placed at the centre of the square. If the system is in equilibrium, then the value of q is?

Which of the following statements about electric field lines is

incorrect?They never cross each other

They always form closed loops

They point from positive toward negative charges

They point away from positive as well as negative charges

Solution

Electric field lines represent the electric field present in a region. The electrostatic field between a test charge and a charged body is represented by the electric field lines that exist between them. Electric field lines never cross each other and point from positive toward negative charge. They do not form closed loops and always start from a positive charge and end on a negative charge.

The correct answer is C.

Please explain how option C is incorrect ! Because I think it would be D....

two equal point charges A and B are R distance apart. A third point charge placed on the prependicular bisector at a distance 'd' from the center will experience maximum electrostatic force when

1. d = R/2 X 1.414

2 d = R/ 1.414

3. d = R 1.414

4. d = 2 X 1.414 R

3.6 x 10 5 N when AB = 0.12m. What is the force of repulsion if AB is increased to

a) 0.24 m b) 0.36 m

Three charges each equal to q are placed at the three corners of a square of side a. Find the electric field at the fourth corner.

Two point charges q

_{2}= 3 x 10^{-6}C and q_{1}= 5 x 10^{-6}C are located at (3 ,5,1,) and (1,3,2) m .find F12and F

_{21}using vector form of coulomb 's law . Also, find their magnitude.when a body becmes negatively charged , its mass

[a] decreases [b] increases

[c] remins the same [d] none of these

q. Two point charges of +16 micro coulomb and -9 micro coulomb are placed 8 cm apart in air .Determine the position of the point at which the resultant field is zero .

Two small balls having equal positive charge q coulomb are suspended by two insulating strings of equal length ' l ' meter from hook fixed to stand.The whole setup is taken in a satellite into sapce where there is no gravity. What is the angle between the two strings and the tension in each string?

an electric dipole of dipole moment 20 *10

^{-6}Cm is enclosed by a closed surface .what is the net flux coming out of the surface?a) q1/q2 = 1 c) q1/q2 <= 1

b) q1/q2 < 1 d) q1/q2 >= 1

2 point charges at distance ' r ' in air exert a force ' F ' on each other, at what distance will these charges experience the same force ' F' in a medium of dielectric constant K?

two fixed point charges +4e and +e units are separated by a distance a .where should the third point charge be placed for it to be in equilibrium ?

how much positive and negative charge is there in a cup of water

Two infinitely long parallel wires having linear charge densities λ1 and λ2 respectively are placed at a distance of R metre. The force per unit length on either wire will be.......?

a) the flux of $\overrightarrow{E}$ through a cube bounded by surfaces x = $\mathcal{l}$, x=2$\mathcal{l}$, y =0, y=$\mathcal{l}$, z=0 and z=$\mathcal{l}$.

(b) the charge within the cube.

_{1}, Q_{2}, Q_{3}, respectively. It is found that the surface charge densities on the outer surfaces of the shells are equal. Then, the ratio of the charges given to the shells, Q_{1}: Q_{2}: Q_{3}is : (1) 1 : 2 : 3 (2) 1 : 3 : 5 (3) 1 : 4 : 9 (4) 1 : 8 : 18what is the principle of vernier calipers

name the system for which electric field at distances 1cm,2cm,3cm are in the ratio 1:1/8:1/27

electrostatic field lines cannot be discontinuous why?

[

Ans.0.05 m from $2.0\times {10}^{-7}$]An electron falls through a distance of 1.5 cm in a uniform electric field of magnitude 2.0 Ã— 10

^{4}N C^{â€“1}in the direction of the field . Then the direction of the field is reversed keeping its magnitude unchanged and a proton falls through the same distance . compute the time of fall in each case.Two charge spheres 10 cm apart attract each other with a force of 3 µN. What force results from each of the following changes,considered separately?

a) Both charges are doubled and the distance remains the same.

b) An uncharged, identical sphere is touched to one of the spheres, and then taken away.

c) The separation is increased to 30 cm.

state Gauss' law in electrostatics.

project to study various factors on which the internal resistance emf of a cell depends

Two charges +2.5 µC and -1.6 µC are kept at a certain distance apart in vacuum. If they attract each other with a force of 0.4 N. Find the separation between them. How and by what percent will the force between them be affected when the separation between them is increased by 25% of the initial value?Find (i) the force on the charge at the centre of shell and at the point A. (ii) the electric flux through the shell.

State and prove

.Gauss TheoremWhat is the angle between the directions of electric field at any 1) axial point 2) equatorial point due to an electric dipole ?

what are the physical significance of electric field??

you are given three uncharged spherical conductors A,B and C touching each other .A glass rod carrying positive charge is briught near.What will be the charges on spheres A,B and C ?

the sum of two point charges is 7uC. they repel each other with a force of 1N when kept 30cm apart in free space. calculate the value of each charge.

_{x}= 5 A x+ 2 B where E is in NC^{-1 }and x in meter , A and B are constants with dimensions . taking A = 10 N C^{-1}m^{-1}and B = 5 NC^{-1}, calculate (i) the electric flux through the cube (ii) net charge enclosed within the cubeIf E=6i+3j+4k, calculate the electric flux through a surface of area 20 units in the YZ plane.

HOW TO DO THIS QUESTION?

The electric field components due to a charge inside the cube of side 0.1 m are as shown:

Where α = 500 N/C − m

E_{y}= 0,E_{z}= 0Calculate (i) the flux through the cube and (ii) the charge inside the cube

A stream of electrons travelling with speed of v m/s at right angles to a uniform electric field E is deflected in a circular path of radius r.Prove that e/m =v2 /rE ?

explain cyclotron in a more elaborate way

A POINT CHARGE -3 MICRO COLUOMB IS PLACED AT THE ORIGIN OF THE CO ORDINATES .CALCULATE THE MAGNITUDE AND DIRECTION AND OF ELECTRIC FIELD INTENSITY AT A POINT X= 2 m ON THE X – AXIS .

PLEASE ANSWER ASAP! URGENT.A certain charge Q is divided into two parts q and Q-q which are then seperated by a certain distance.What must q be iin terms of Qto maximise the electrostatics repulsion between the two charges?

what is the source charge and test charge

a negatively charge particle is placed exactly midway between two fixed particles having equal positive charge.what will happen to the charge?

Why does the electric field inside a dielectric decrease when it is placed in an external electric field?

a car moving with a speed of 40km/hr can be stopped by applying brakes after at least 2m.If the same car is moving with 80km/hr.What is the least stopping distance?

a semi infinite line charge of linear charge density 'D' has the shape of an infinitely long straight wire whose one end is connected to three-fourth circle of radius 'R' while one of the diameters of 3/4th circle is parallel to the infinitely long straight part.What is the field at the centre of the circle.How?