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Brass has a tensile strength `3.5 × 10^8 N'/'m^2` . What charge density on this material will be enough to break it by electrostatic force of repulsion? How many excess electrons per square Å will there then be? What is the value of intensity just out side the

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

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An isolated conducting sheet of area A and carrying a charge Q is placed in a uniform electric field E, such that electric field is perpendicular to sheet and covers all the sheet. Find out charges appearing on its two surfaces.

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

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An isolated conducting sphere of charge Q and radius R is connected to a similar uncharged sphere (kept at a large distance) by using a high resistance wire. After a long time what is the amount of heat loss

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

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An electric field is given by `vecE=(yhati+xhatj)N/C`. Find the work done (in J) in moving a 1C charge from `vecr_A=(2hati+2hatj)m` to

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

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The arrangement shown consists of three elements. (i) A thin rod of charge `–3.0 muC` that forms a full circle of radius 6.0 cm. (ii) A second thin rod of charge `2.0 muC` that forms a circular arc of radius 4.0 cm and concentric with the full circle, subtending an angle of 90° at the centre of the full circle. (iii) An electric dipole with a dipole moment that is perpendicular to a radial line and has magnitude `1.28 × 10^(–21)C-m.` Find the net electric potential in volts at the

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

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Electric field in a region is given by `vecE=-4xhati+6yhatj`. The charge enclosed in the cube of side 1m oriented as shown in the diagram is given by `alphaepsilon_0` . Find the value of

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

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A point charge q is situated at a distance r from one end of a thin conducting rod of length L having a charge Q (uniformly distributed along its length). The magnitude of electric force between the two, is

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

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If electron in ground state of H-atom is assumed in rest then dipole moment of electron proton system of H-atom is ............... . Orbit radius of H atom in ground state is `0.56 A^o`

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

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The electric Potential V at any Point o (x, y, z all in metres) in space is given by `V = 4x^2` volt. The electric field at the point (1m, 0.2m) in volt/metre is

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

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Four equal charges Q are placed at the four corners of a square of each side is ‘a’. Workdone in removing a charge - Q from its centre to infinity is

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

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When a planet X is at a distance of 824.7 million kilometers from earth its angular diameter is measured to be `35.72^(11)` of arc. Calculate the diameter of

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

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A particle is acted by a constant power. Then, which of the following physical quantity remains

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

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A train, standing in a station-yard, blows a whistle of frequency 400 Hz in still air. The wind starts blowing in the direction from the yard to the station with a speed of 10 m `s^(–1)`. What are the frequency, wavelength, and speed of sound for an observer standing on the station’s platform? Is the situation exactly identical to the case when the air is still and the observer runs towards the yard at a speed of 10 m `s^(–1)`? The speed of sound in still air can be taken as 340 m

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

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The power factor of a good choke coil

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For high frequency, a capacitor

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In the adjoining figure the impedance of the circuit will

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For the circuit shown, which of the following statement(s) is(are)

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Answer the following questions regarding earth’s magnetism: In which direction would a compass free to move in the vertical plane point to, if located right on the geomagnetic north or south

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

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Answer the following questions: Interstellar space has an extremely weak magnetic field of the order of 10–12 T. Can such a weak field be of any significant consequence? Explain. [Note: Exercise 2 is meant mainly to arouse your curiosity. Answers to some questions above are tentative or unknown. Brief

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

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Magnetic field lines are always nearly normal to the surface of a ferromagnet at every point. (This fact is analogous to the static electric field lines being normal to the surface of a conductor at every point.)

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

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