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Syllabus

what is the meaning of quantisation of charge?

^{2})A) work done by friction force on block B is zero in time interval t = 0 to t = 3s.

B) work done by friction force on block A is zero in time interval t = 0 to t = 3s.

C) work done by tension on B is also zero in time interval t = 0 to t = 3s.

D) speed of blocks at t = 10s is 27.5 m/s.

_{0}?what is the source charge and test charge

Difference between gravitational force and electrostatic force

(A) 20 N (B) 100 N (C) 80 N (D) 500 N

what is the dimensional formula of epsilon not?

what is N=nNa

Two 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?

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....

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?

straight wire are E1 or E2 respectively. The ratio of E1 and E2 will be?

(A) 1/2 (B) 2/1 (C) 1/1 (D) None of these

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.

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)

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

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?

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

what is charge body? explain it

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) n0/𝜀0, left B) n0/𝜀0, right C) 2n0/𝜀0, left D) 2n0/𝜀0, right

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?

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

Â What is quantisation of charge?

What are the limitations of Coulomb's Law ?

state any two postulates of bohr's theory of hydrogen atom. what is the maximum possible number of spectral lines observed when hydrogen atom is in its second excited state. justify your answer. calculate ratio of the maximum and minimum wavelength of the radiations emitted in this process.

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})a] the inverse square distance law applies

b] forces are proportional to physical properties

c] potential energy is a function of distance of separation

d] Forces are either attractive or repulsive

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?

Electric field strength, E=V/r what is V and r

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

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.

Q.66. The work done in bringing two charges (q) at a distance 'a' from each other is 2 mJ. Four charges q, - q, q and - q are brought to the four corners of a square of edge 'a' the work done will be

(A) 0

(B) 2 mJ

(C) - 2 mJ

(D) none of these

when a body becmes negatively charged , its mass

[a] decreases [b] increases

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

Q.29. The three water filled tanks shown have the same volume and height. If small identical holes are punched near this bottom, which one will be the first to get empty?

A) (i)

B) (ii)

C) (iii)

D) All will take same time

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?

_{1}. When a charge q is added in the system without disturbing other charges, the potential energy becomes U_{2}. The potential of the point where the charge q is placed in the system is.$\left(A\right)\frac{{U}_{2}-{U}_{1}}{q}\phantom{\rule{0ex}{0ex}}\left(B\right)\frac{{U}_{1}-{U}_{2}}{q}\phantom{\rule{0ex}{0ex}}\left(C\right)\frac{{U}_{1}+{U}_{2}}{2q}\phantom{\rule{0ex}{0ex}}\left(D\right)\frac{{U}_{2}-{U}_{1}}{2q}$

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?why do electrostatic experiments not work well on humid days

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 ?

what does 600 B.C mean?

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

(a) These originate from positive charge and end on negative charge

(b) they do not intersect each other at a point

(c) They have the same form for a point charge and a sphere.

(d) They have spherical existence.

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.......?

why does electrical conductivity of earth's atmosphere increase with latitude?is it because its density goes on decreasing?

_{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 : 18ρ_{0}is a positive constant,dis the thickness of the plate andx= 0 is the centre of the plate.114. Use Gauss' law of find

E(a)(1)

ρ_{0}_{ }a/ε_{0 }(2) 2ρ_{0}_{ }a/ε_{0}(3)ρ_{0}_{ }a/2ε_{0}(4) 4ρ_{0}_{ }a/ε_{0}what is the principle of vernier calipers

electrostatic field lines cannot be discontinuous why?

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.state Gauss' law in electrostatics.

A free proton and a free electron are placed in a uniform field. Which of the two

experience greater force and greater acceleration?

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

Two point charges one 4 times as strong as the other are placed at a certain distance apart in air. The force between them is 0.4 N. When the distance between them is decreased by 10 cm, the force is increased by 0.5 N. Calculate the charges and their original separation.Find (i) the force on the charge at the centre of shell and at the point A. (ii) the electric flux through the shell.

$\left(i\right)C\left(ii\right){C}^{-1}\left(iii\right){C}^{2}\left(iv\right){C}^{-2}$

State and prove

.Gauss Theorem^{2}if it has surface density of charge 5 stat coulomb/ cm^{2}What 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??

25. In the triangular sheet given PQ = QR =l If M is the mass of the sheet. What is the moment of inertial about PR

$\left(\mathrm{A}\right)\frac{{\mathrm{Ml}}^{2}}{24}\left(\mathrm{B}\right)\frac{{\mathrm{Ml}}^{2}}{12}\left(\mathrm{C}\right)\frac{{\mathrm{Ml}}^{2}}{6}\left(\mathrm{D}\right)\frac{{\mathrm{Ml}}^{2}}{18}$

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.

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.

_{1}and that in the string connecting B and C is T_{2}, then is : (1) 2 (2) 0.5 (3) 4 (4) 0.25If E=6i+3j+4k, calculate the electric flux through a surface of area 20 units in the YZ plane.

why does a soap bubble has two surfaces??

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

explain cyclotron in a more elaborate way

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 component of electric field intensity parallel to the surface of a charged conductor.?explain how with a figure

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

An electric dipole is placed at the origin O such that its equator is y-axis.At a point P far away from dipole the electric field direction is along y-direction. OP makes an angle a with the x axis such that

-tan a=root 3

-tan a=root 2

-tan a=1

-tan a=1/root2

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?

24. A block of mass 3kg is connected with two identical massless springs A and B and a block mass 2kg is hanging with a third identical spring C as shown in figure then the magnitude of acceleration of 3kg and 2kg block just after cutting the spring A