64 drops of mercury, each charged to a potential of 10 V, are combined to form one bigger drop. The potential of this drop will be(Assume all drops are spherical)
Options
(a) 160 […]
A particle is under two mutually perpendicular simple harmonic motions having different amplitudes and a phase difference of π/2. The path of the particle will be
Options
(a) circular (b) straight line (c) […]
A bucket full of water is revolved in a vertical circle of 2m. What should be the maximum time period of revolution so that the water does not fall off the bucket?
Options
A milli ammeter of range 10 mA has a coil of resistance 1 ohm. To use it as voltmeter of range 10V, the resistance that must be connected in series with it, will be
A body of mass m is placed on the earth’s surface. It is taken from the earth’s surface to a height h=3R. The change in gravitational potential energy of the body is
Options
A wire of length 1 m is placed in a uniform magnetic field of 1.5 tesla at an angle of 30° to it. The current in the wire is 10 amp. Then the force on […]
A solenoid 1.5 m long and 0.4 cm in diameter possesses 10 turns per cm length. A current of 5 A falls through it. The magnetic field at the axis inside the solenoid is
A ray of light is incident on a transparent glass slab of refractive index 1.62. The reflected and refracted rays are mutually perpendicular. The angle of incidence is
Options
(a) 58.3° (b) 50° […]
The drift velocity of free electrons in a conductor is v, when a current I is flowing in it. If both, the radius and the current is doubled, then drift velocity will be
Options […]
With the decrease of current in the primary coil from 2 amperes to zero value in 0.01sec, the emf generated in the secondary coil is 1000 volts. The mutual inductance is
Options
(a) […]
2017 Copyright Doctor Dreams Training Academy