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

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Assertion: Bulb generally get fused when they are switched ON or OFF. Reason: When we switch ON or OFF, a circuit current changes it

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

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Assertion: Electron moving perpendicular to B will perform circular motion. Reason: Force by magnetic field is perpendicular to

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

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The relation between the magnetic length `(L_e)` and the geometric length `(L_g)` is best represented

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

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Which of the following statement(s) is/are

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

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Assertion: If the inner solenoid is much shorter than (and placed well inside) the outer solenoid, then the flux linkage `N_1phi_1` can still be calculated. Reason: The inner solenoid is effectively immersed in a uniform magnetic field due to the outer

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

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Name the physical quantity which remains same for microwaves of wavelength 1 mm and UV-radiation of `1600 A^0` in

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

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If a ray of light propagates from a rarer to a denser medium, how does its frequency

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

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Why are convex mirrors used as side view mirrors in

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

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Draw a schematic diagram of a reflecting telescope (Cassegrain). Write two important advantages that the reflecting telescope has over a refracting

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

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Estimating the following two numbers should be interesting. The first number will tell you why radio engineers do not need to worry much about photons! The second number tells you why our eye can never ‘count photons’, even in barely detectable light. The number of photons entering the pupil

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

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Consider Fig. for photoemission. how would you reconcile with momentum-conservation? Note light (photons) have momentum in a different direction than the emitted

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

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Two monochromatic beams A and B of equal intensity I, hit a screen. The number of photons hitting the screen by beam A i twice that by beam B. Then what inference can you make about their

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

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A 0.20 Kg aluminum block at `80^oC` is dropped in a copper calorimeter of mass 0.05 Kg containing `200 cm^3` of ethyl alcohol at `20^oC`. What is the final temperature of the mixture? Given Density of ethyl alcohol = `0.81 g | cm^3` ; specific heat of ethyl alcohol `= 0.6 cal | g | '^oC` ; specific heat of copper `= 0.094 cal | g | '^oC`, specific heat of `Al = 0.22 cal | g |

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

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A deutron of K. E. 50 kev is describing a circular orbit of radius 0.5 m in a plane perpendicular to magnetic field `vecB`. The K.E. of the proton that describe a circular orbit of radius 0.5 m in the same plane with the same `vecB` is

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

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Assertion: In electrostatics, all charges whether free or bound are considered to be at rest.Reason: The charges in motion constitute an electric

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

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If the velocity of charged particle has both perpendicular and parallel components while moving through a magnetic field, what is the path followed by a charged

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

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Magnetic field in a region is produced only by

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

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Assertion: The magnetic field produced by a current carrying solenoid is independent of its length and cross-sectional area. Reason: The magnetic field inside the solenoid is

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

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In a medium of dielectric constant K, the electric field is E. If `in_o` is permittivity of the free space, the electric displacement vector

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

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