A body of mass m is orbiting the earth at a radius r from the center of earth
A body of mass m is orbiting the earth at a radius r from the center of earth. Another body of mass 2m is orbiting at a radius 2r. What is the ratio of their […]
Physics
The magnetic susceptibility of a material of a rod is 449. Permeability of vaccum
The magnetic susceptibility of a material of a rod is 449. Permeability of vaccum is 4 π x 10⁻⁷ henry/m. Absolute permeablity of the material of the rod in henry/meter is
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(a) […]
The r.m.s speed of the molecules of a gas in a vessel is 400 m/s
The r.m.s speed of the molecules of a gas in a vessel is 400 m/s. If half of the gas leaks out at constant temperature, the r.m.s speed of the remaining molecules will be
The de-Broglie wavelength of an electron having 80 eV of energy is nearly
The de-Broglie wavelength of an electron having 80 eV of energy is nearly(Given 1 ev= 1.6 x 10⁻¹⁹ kg, Mass of electron=9 x 10⁻³¹ kg, Planck’s constant= 6.6 x 10⁻³⁴ J-sec)
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(a) […]
Thomson coefficient of a conductor is 10 µV/K. Its two ends are kept
Thomson coefficient of a conductor is 10 µV/K. Its two ends are kept at 50° C and 60° C. Amount of heat absorbed by the conductor when a charge of 10C flows through it is […]
Two pendulums A and B are oscillating simultaneously with time period
Two pendulums A and B are oscillating simultaneously with time period T and 5T/4 respectively. What is the phase difference between them after B completes one oscillation?
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(a) 60° (b) 45° (c) […]
A particle under the action of a constant force moves from rest upto 20 seconds
A particle under the action of a constant force moves from rest upto 20 seconds. If distance covered in first 10 seconds is S₁ and that covered in next seconds is S₂, then
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A body of mass 2 kg is kept by pressing to a vertical wall by a force of 100 N
A body of mass 2 kg is kept by pressing to a vertical wall by a force of 100 N. The coefficient of static friction between wall and body is 0.3. Then the frictional force […]
A current is flowing through resistance. A potential difference of 120 V
A current is flowing through resistance. A potential difference of 120 V is applied across resistance. Power dissipated in resistance is 60W. Find current flowing through it
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(a) 2 A (b) 0.5 […]
The time period of bar magnet is doubled when magnetic field is reduced
The time period of bar magnet is doubled when magnetic field is reduced by same amount. If initial magnetic field is 0.4 x 10⁻⁴ T then find out decrease in the magnetic field
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