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Syllabus

what is the meaning of quantisation of charge?

a) q1/q2 = 1 c) q1/q2 <= 1

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

_{0}?Difference between gravitational force and electrostatic force

Q48. A car of mass 400 kg is pulling a coach of mass 300 kg with a force of 4500 N. If the coefficient of friction is 0.001 , what is tension ?

(a) 21000 N (b) 2126 N

(c) 1929 N (d) 2750 N

what is the dimensional formula of epsilon not?

^{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.

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?

21. Calculate the flux through the cuboid shown in the figure for $\stackrel{\rightharpoonup}{\mathrm{E}}={\mathrm{E}}_{0}\mathrm{y}\hat{\mathrm{j}}:-$$\stackrel{\rightharpoonup}{\mathrm{E}}={\mathrm{E}}_{0}\mathrm{y}\hat{\mathrm{j}}:-$

(1) E

_{0}abc (2) E_{0}abd (3) E_{0}abcd (4) Zero.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?

what is N=nNa

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.

What will be the value of electric field at the centre of electric dipole?(a)Zero

(b)Equal to the electric field due to one charge at centre

(c)Twice the electric field due to one charge at centre

(d)half the value of electric field due to one charge at centre.

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

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)

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.?

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

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

what does q1+q2 =0 signify in electrostatics?

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

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 ????

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 centre of the cube of side "l". What is the electric flux passing through each face of the cube?

when a body becmes negatively charged , its mass

[a] decreases [b] increases

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

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

What is quantisation of charge?

What are the limitations of Coulomb's Law ?

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})passing through the cube normally will be

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?

(A) $900\frac{V}{m}$

(B) $9\frac{kV}{m}$

(C) $90\frac{V}{m}$

(D) can't be determined

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

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 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.

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

what is the source charge and test charge

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?when is a dipole in unstable equilibrium in an electric field ?

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?

What is the amount of work done in moving a 200 nC charge between two points 5 cm apart on an equipotential surfaces?

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 ?

1. Mechanical force acting on a charged conductor has same value irrespective of shape of conductor.Comment.

2. If a coin charged in air is placed in kerosine which of the following quantities will be affected?

i)charge

ii)charge density

iii)electric field

iv)energy density

v)force per unit area

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

assertion: if electric flux over a closed surface is negative then the surface encloses net negative charge

reason: electric flux is independent of charge distribution inside the surface.

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.......?

Q. Moment of inertia of a semicircular ring of radius R and mass M; about an axis passing through A and perpendicular to the plane of the paper is

$\left(\mathrm{A}\right)\frac{2}{3}{\mathrm{MR}}^{2}\left(\mathrm{B}\right)\mathrm{MR}2\left(\mathrm{C}\right)\frac{{\mathrm{MR}}^{2}}{2}\left(\mathrm{D}\right)2{\mathrm{MR}}^{2}$ ans d

_{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 : 183. The volume charge density within a volume V is $\mathrm{\rho}\left(\mathrm{r}\right)$. What is the force on a small test charge ${\mathrm{q}}_{0}$ placed outside the volume having position vector $\overrightarrow{{\mathrm{r}}_{0}}$ with respect to the same origin considered to specify the position vector of the charge distribution within the volume.

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 × 10

^{4}N C^{–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.

What is the graph between electric field and r^2 , 1/r^2 and 1/r^3???

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

Q.22. Two uniform spheres having opposite charges. The coulomb force of attraction between them is F. When they are connected by a wire, coulomb force of repultion becomes F/ 15. The ratio of charge on spheres initially was ..........

(1) $\frac{2}{3}$

(2) $\frac{1}{2}$

(3) $\frac{2}{5}$

(4) $\frac{3}{5}$

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 Theorem(a) I (b) II (c) III (d) IV

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??

covered cork balls of 1.5 x 10-4kg each suspended by threads 10 cm long (see Fig.).When equal electric

charges are placed on the balls, the electric repulsive force pushes them apart, and the angle between the

threads indicates the magnitude of the electric charge. If the equilibrium angle between the threads is

60degree, what is the magnitude

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.

the coil? If magnetic field is reduced to zero in 10 s, then find the induced

emf?

If 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

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

explain cyclotron in a more elaborate way

14) Two point charges are kept separated by 4cm of air and 6cm of a dielectric of relative permitivity 4, Te equivalent dielectric separation between them so far theircoulombian interaction is conserved is?

16) charge on 500cc water due to protons will be?

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 work done by an electric field in rotating a dipole from its unstable equilibrium to stable equilibrium? does the energy of dipole increase or decrease in this process why?

(A) zero

(B) q

(C) qE(PQ + QR + SR + SP)

(D) q/ε∘

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

A small plane area is rotated in a electric field . In which orientation of the area is the flux of electric field through area is maximum? In which orientation is it zero?

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?