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Assertion: When a metallic conductor is moved in and out in a magnetic field, then an induced emf is produced across it. Reason: Eddy current will not be produced in a metallic surface moving in and out of magnetic

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When an AC voltage is applied to an L-C-R circuit,

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In a L-C-R series circuit, the potential difference between the terminals of the inductance is 60 V, between the terminals of the capacitor is 30 V and that across the resistance is 40 V. Then, supply voltage will be equal to

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Which of the following statements is/are incorrect about

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Use the mirror equation to show that on object placed between F and 2F of a concave mirror produces a real image beyond 2

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A convex lens made up of a glass of refractive index 1.5 is dipped in turn in (i) a medium of refractive index 1.65 (ii) a medium of refractive index 1.33 (a) Will it behave as a converging lens or a diverging lens in the two cases? (b) How will its focal length change in the two

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

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(i) A ray PQ of light is incident on the face AB of a glass prism ABC (as shown in the figure) and emerges out of the face AC. Trace the path of the ray. Show that `/_i+/_e=/_A+/_delta` where, `delta` and e denote the angle of deviation and angle of emergence respectively. Plot a graph showing the variation of the angle of deviation as a function of angle of incidence. State the condition under which `/_delta` is minimum. (ii) Find out the relation between the refractive index `(mu)` of the glass prism and `/_A` for the case, when the angle

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

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A circular disc of radius ‘R’ is placed co-axially and horizontally inside an opaque hemispherical bowl of radius ‘a’ (Fig). The far edge of the disc is just visible when viewed from the edge of the bowl. The bowl is filled with transparent liquid of refractive index μ and the near edge of the disc becomes just visible. How far below the top of the bowl is the disc

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What is the effect on the interference fringes in a Young’s double-slit experiment due to: the separation between the two slits is

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Unpolarised light is incident on a plane glass surface. What should be the angle of incidence so that the reflected and refracted rays are perpendicular to each

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(a) Two monochromatic waves emanating from two coherent sources have the displacements represented by `Y_1 = a cosomegat` and `Y_2 = a cos(omegat+phi)`, where `(phi)` is the phase difference between the two waves. Show that the resultant intensity at a point due to their superposition is given by `I =4I_0cos^2 phi//2`, where `I_0 = a^2`. (b) Hence, obtain the conditions for constructive and destructive

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

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Four identical monochromatic sources A,B,C,D as shown in the (Fig.) produce waves of the same wavelength λ and are coherent. Two receiver R1 and R2 are at great but equal distaces from B. Which of the two receivers can distinguish which of the sources B or D has been

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Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW. Find the energy and momentum of each photon in the light

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Why are de – broglie waves associated with a moving football is not

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The surface charge density of a thin charged disc of radius R is σ. The value of the electric field at the centre of the disc is sigma/(2in_0)`. With respect to the field the centre, the electric field along the axis at a distance R from the centre of the disc reduces

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

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Find charge on each spherical shell after joining the inner most shell and 1 outer most shell by a conducting wire. Also find charges on each

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Tw o small charged spheres repal each other with a force `2 xx10^(-3) N` . The charge on one sphere is twice that of the other. When these two spheares displaced 10 cm further apart the force is `5xx 10^(-4) N` , then the charges on both the spheres are

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If velocity of light c, Planck’s constant h and gravitational contant G are taken as fundamental quantities then express mass, length and time in terms of dimensions of these

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

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What amount of heat must be supplied to `2.0 × 10^(–2)` kg of nitrogen (at room temperature) to raise its temperature by 45 °C at constant pressure ? (Molecular mass of `N_2` = 28; R = 8.3 J mo`l^(–1)`

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

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In the previous problem, if 15.0 cm of water and spirit each are further poured into the respective arms of the tube, what is the difference in the levels of mercury in the two arms ? (Specific gravity of mercury =

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

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