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(a) An air filled capacitor is given a charge of 2 µ C raising its potential to 200 V. If on inserting a dielectric medium, its potential falls to 50 V, what is the dielectric constant of the medium?(b) A conducting stab of thickness‘t’ is introduced without touching between the plates of a parallel plate capacitor separated by a distance d (t < d). Derive an expression for the capacitance of a

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A square surface of side L. meter in the plane of the paper is placed in a uniform electric field `E ('volt'/m)` acting along the same plane at an angle `theta` with the - horizontal side of the square as shown in Figure. The electric flux linked to

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A particle of mass m and charge q is placed r at rest in a uniform electric field E and then released. The kinetic energy attained by the particle after moving a distance y

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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For a spherically symmetrical charge distribution, electric field at a distance r from the centre of sphere is `vecE=kr^7hatr`, where k is a constant. What will be the volume charge density at a distance r from the centre of sphere

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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For the system shown in figure, if the resultant force on q is zero, then Q =

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Two equal negative charges –q are fixed at points (o, a) and (o, –a) on the Y axis. Apositive charge q is released from rest at the point `x (x < < a)` on the X-axis, then thefrequency of motion is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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An electric dipole coincides on z axis and its mid point is on origin of the cartesian co-ordinate system. The electric field at an axial point at a distance z from origin is `vecE`(z) and electric field at an equatorial point at a distance y from origin is `vecE(y) |vecE_((z))/vec E_((y))| (y = z > > a) =`

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In the electric field of a point charge q, a certain charge is carried from point A to B, C, D and E. Then the work done

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Two charged spheres of radii R1 and R2 having equal surface charge density. The ratio of their potential is

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4 Points charges each +q is placed on the circumference of a circle of diameter 2d in such a way that they form a square. The potential at the centre is

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The farthest objects in our Universe discovered by modern astronomers are so distant that light emitted by them takes billions of years to reach the Earth. These objects (known as quasars) have many puzzling features, which have not yet been satisfactorily explained. What is the distance in km of a quasar from which light takes 3.0 billion years to reach us

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A spring having with a spring constant 1200 N `m^(–1)` is mounted on a horizontal table as shown in Fig. . A mass of 3 kg is attached to the free end of the spring. The mass is then pulled sideways to a distance of 2.0 cm and released. Determine (i) the frequency of oscillations, (ii) maximum acceleration of the mass, and (iii) the maximum speed of the

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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1MW power is to be delivered from a power station to a town 10 km away. One uses a pair of Cu wires of radius 0.5 cm for this purpose. Calculate the fraction of ohmic losses to power transmitted if power is transmitted at 220V. Comment on the feasibility

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In transformer, core is made of soft iron to

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When 10V, DC is applied across a coil current through it is `2.5 A,` if `10V, 50 Hz A.C.` is applied current reduces to 2 A. Calculate reactance of the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The radius of a coil decreases steadily at the rate of `10^(–2)` m/s. A constant and uniform magnetic field of induction `10^(–3) Wb'/'m^2` acts perpendicular to the plane of the coil. The radius of the coil when the induced e.m.f. in the coil is `1muV`, is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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An inductor `(X_L=2Omega)` a capacitor `(X_C=8Omega)` and a resistance `(8Omega)` is connected in series with an ac source. The voltage output of A.C source is given by `V=10 cos 2pi50t`. Find the instantaneous p.d. between A and B when the voltage output from source is half of its

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Answer the following questions: A magnetic field that varies in magnitude from point to point but has a constant direction (east to west) is set up in a chamber. A charged particle enters the chamber and travels undeflected along a straight path with constant speed. What can you say

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Answer the following questions: The earth’s core is known to contain iron. Yet geologists do not regard this as a source of the earth’s magnetism.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A short bar magnet of magnetic moment m = 0.32 JT–1 is placed in a uniform magnetic field of 0.15 T. If the bar is free to rotate in the plane of the field, which orientation would correspond to its

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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