Hot questions

0 votes

0 answers

Match the Column I (type of body) with Column II (electric field) and select the correct answer from the codes given below. Column I Column II A. Infinite plane sheet of charge p. `(lambda)/(2piepsilon_0r)` B. Infinite plane sheet of uniform thickness q. `(sigma)/(2epsilon_0)` C. Infinitely long uniformly charged straight wire r. `(sigma)/(epsilon_0)`

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

0 votes

0 answers

Assertion: Electric lines of force cross each other. Reason: Electric field at a point does not superimposes to give one resultant electric

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

0 votes

0 answers

Charge between Parallel Plates Surface charge density is defined as the charge per unit surface area of surface charge distribution, `i.e. sigma = (dq)/(dS)`Two large, thin metal plates are parallel and close to each other. On their inner faces, the plates have surface charge densities of opposite signs having magnitude of `17.0 xx 10^(-22) Cm^(-2)` as shown belowThe intensity of electric field at a point is `E=(sigma)/(epsilon_0)`where, `epsilon_0` = permittivity of free space`E` in the outer region of the second plate

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

0 votes

0 answers

The resistance of a wire is R ohm. If it is melted and stretched to `n` times its original length, its new resistance will

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

0 votes

0 answers

In the electric circuit shown, each cell has an emf of `2 V` and internal resistance is `1Omega` . The external resistance is `2Omega`. The value of the current `I` is (in

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

0 votes

0 answers

Two long conductors, separated by a distance d carry currents `I_1 and I_2` in the same direction. They exert a force F on each other. Now, the current in one of them is increased to two times and its direction is reversed. The distance is also increased to `3d`. The new value of the force between them

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

0 votes

0 answers

A bar magnet of magnetic moment `M_1` is axially cut into two equal parts. If these two pieces are arranged perpendicular to each other, the resultant magnetic moment is `M_2`, then the value of `M_1'/'M_2`

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

0 votes

0 answers

A conducting rod of length `l` is falling with a constant velocity `v` perpendicular to a uniform horizontal magnetic field `B`. The potential difference between its two ends will

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

0 votes

0 answers

Self-Induction Self-induction is the property of a coil by virtue of which the coil opposes any change in the strength of current flowing through it by inducing an emf in itself. This induced emf is also called back emf. When the current in a coil is switched ON, then the self induction opposes the growth of the current and when it is switch OFF, then the self-induction opposes the decay of the current.Calculate the inductance of an air core solenoid containing 300 turns, if length of solenoid is `12pi cm` and its cross-sectional area is `4

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

0 votes

0 answers

In an AC series L-C-R circuit, applied voltage is `V= {100sqrt2 sin (omegat + 45°)} V` Given that, `R - 30 Omega, X_L = 50 Omega and X_c = 10 Omega.` Now match the following two columns. Column I Column II A. Current in the circuit p. 120 SI units B. Power dissipated in the circuit q. 60 SI units C. Potential difference across resistance r. 2 SI units D. Potential difference across inductance s. None

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

0 votes

0 answers

The far point of a myopic person is 80 cm in front of the eye. What is the power of the lens required to enable him to see very distant objects

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

0 votes

0 answers

A convex lens is placed in contact with a plane mirror. A point object at a distance of 20 cm on the axis of this combination has its image coinciding with itself. What is the focal length of the

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

0 votes

0 answers

State Huygens' principle. Using this principle draw a diagram to show how a plane wavefront incident at the interface of the two media gets refracted when it propagates from a rarer to a denser medium. Hence, verify Snqll's law of

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

0 votes

0 answers

Monochromatic light of frequency 6.0 ×1014 Hz is produced by a laser. The power emitted is 2.0 ×10–3 W. What is the energy of a photon in the light

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

0 votes

0 answers

The work function of caesium is 2.14 eV. Find the wavelength of the incident light if the photocurrent is brought to zero by a stopping potential of 0.60

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

0 votes

0 answers

The wavelength of light in the visible region is about 390 nm for violet colour, about 550 nm (average wavelength) for yellowgreen colour and about 760 nm for red colour. What are the energies of photons in (eV) at the (i) violet end, (ii) average wavelength, yellow-green colour, and

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

0 votes

0 answers

Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW. How many photons per second, on the average, arrive at a target irradiated by this beam? (Assume the beam to have uniform cross-section which is less than the target

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

0 votes

0 answers

An electric dipole is placed along the x-axis at the origin O. A point P is at a distance of 20 cm from this origin such that OP makes an angle T/3 with the x-axis. If the electric field at P makes an angle 0 with the x-axis, the value of 0 would

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

0 votes

0 answers

In a certain region of space, electric field is along the z-direction throughout. The magnitude of electric field is, however, not constant but increases uniformly along the positive z-direction, at the rate of 105 NC–1 per metre. What are the force and torque experienced by a system having a total dipole moment equal to 10–7 Cm in the negative z-direction

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

0 votes

0 answers

Obtain the formula for the electric field due to a long thin wire of uniform linear charge density E without using Gauss’s law. [Hint: Use Coulomb’s law directly and evaluate the necessary

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

Hot questions

Categories