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Assertion: When coil in galvanometer with metallic core oscillates, then electromagnetic damping occurs. Reason: Eddy currents generated in the core opposes the motion and brings the coil to rest

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

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In an L-C-R series AC circuit, if `omega_0` is the resonant angular frequency, then the quality factor (Q-factor) is given

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

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Calculate the speed of light in a medium whose critical angle is

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Under what condition does the formation of rainbow

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Two thin lenses of power + 5 D and -2 .5 D are in contact. What is the focal length of the

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Draw a ray diagram showing the image formation by a compound microscope. Hence, obtain expression for total magnification when the image is formed at the

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A passenger in an aeroplane

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Consider an extended object immersed in water contained in a plane trough. When seen from close to the edge of the trough the object looks distorted

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Describe Young's double slit experiment to produce interference pattern due to a monochromatic source of light. Deduce the expression for the fringe

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

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How does the fringe width in ' Young's double slit experiment, change when the distance of separation between the slits and screen is

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Can reflection result in plane polarised light if the light is incident on the interface from the side with higher refractive

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Show that the wavelength of electromagnetic radiation is equal to the de Broglie wavelength of its quantum

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Consider a beam of electrons (each electron with energy E0) incident on a metal surface kept in an evacuated chamber.

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

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A small sphere carrying a charge q' is hanging in between two parallel plates by a string of length L. Time period of pendulum is `T_o`. When parallel plates are charged, the time period changes to T. The ratio T/`T_o` is equal

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

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A particle of mass m carrying charge `'+q_1 '` is revolving around a fixed charge `'–q_2'` in a circular path of radius r. Calculate the period of

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

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Calculate force on a dipole in the surrounding of a long charged wire as shown in the

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A circular disc of mass 10 kg is suspended by a wire attached to its centre. The wire is twisted by rotating the disc and released. The period of torsional oscillations is found to be 1.5 s. The radius of the disc is 15 cm. Determine the torsional spring constant of the wire. (Torsional spring constant α is defined by the relation J = –α θ , where J is the restoring couple and θ the angle of

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

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A 2 Mev proton is moving perpendicular to a uniform magnetic field of 2.5 tesla. The force on the proton

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The connections between resistors in a meter bridge are made of thick copper strips because thick copper strips have

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Long wire of the potentiometer gives lower value of................ which increases sensitivity of

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

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