A source of sound S emitting waves of frequency 100 Hz and an observer
A source of sound S emitting waves of frequency 100 Hz and an observer O are located at some distance from each other. The source is moving with a speed of 19.4 ms⁻¹ at an […]
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A satellite S is moving in an elliptical orbit around the earth. The mass
A satellite S is moving in an elliptical orbit around the earth. The mass of the satellite is very small compared to the mass of the earth. Then,
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(a) the linear momentum […]
A remote-sensing satellite of earth revolves in a circular orbit at a height
A remote-sensing satellite of earth revolves in a circular orbit at a height of 0.25 x 10⁶ m above the surface of earth. If earth’s radius is 6.38 x 10⁶ m and g=9.8 ms⁻², then […]
A rectangular coil of length 0.12 m and width 0.1 m having 50 turns of wire
A rectangular coil of length 0.12 m and width 0.1 m having 50 turns of wire is suspended vertically in a uniform magnetic field of strength 0.2 Weber/m². The coil carries a current of 2A. […]
A proton and an alpha particle both enter a region of uniform magnetic field B,
A proton and an alpha particle both enter a region of uniform magnetic field B, moving at right angles to the field B. If the radius of circular orbits for both the particles is equal […]
A potentiometer wire of length L and a resistance r are connected in series with
A potentiometer wire of length L and a resistance r are connected in series with a battery of e.m.f. E₀ and a resistance r₁. An unknown e.m.f. E is balanced at a length l of […]
A plank with a box on it at one end is gradually raised about the other end.
A plank with a box on it at one end is gradually raised about the other end. As the angle of inclination with the horizontal reaches 30⁰, the box starts to slip and slides 4.0 […]
A photoelectric surface is illuminated successively by monochromatic light of wavelength
A photoelectric surface is illuminated successively by monochromatic light of wavelength λ and λ/2. If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, […]
A particle is executing a simple harmonic motion. Its maximum acceleration
A particle is executing a simple harmonic motion. Its maximum acceleration is α and maximum velocity is β. Then, its time period of vibration will be
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(a) β²/α (b) 2πβ/α (c) β²/α² […]
A parallel plate air capacitor has capacity C, distance of seperation between plate
A parallel plate air capacitor has capacity C, distance of seperation between plate is d and potential difference V is applied between the plates. Force of attraction between the plates of the parallel plate air […]