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Easy
Question
A step-down transformer is connected to main supply 
to operate a 
bulb. The current in primary is
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Two identical circular loops of metal wire are lying on a table. Loop 
carries a current which increases with time. In response, the loop 
Two identical circular loops of metal wire are lying on a table. Loop carries a current which increases with time. In response, the loop
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A solenoid 60 mm long has 50 turns on it and is wound on an iron rod of 7.5 mm radius. Find the flux through the solenoid when the current in it is 3A. The relative permeability of iron is 600
A solenoid 60 mm long has 50 turns on it and is wound on an iron rod of 7.5 mm radius. Find the flux through the solenoid when the current in it is 3A. The relative permeability of iron is 600
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A conducting rod of length 
is falling with a velocity 
perpendicular to a uniform horizontal magnetic field . The potential difference between its two ends will be
A conducting rod of length is falling with a velocity perpendicular to a uniform horizontal magnetic field . The potential difference between its two ends will be
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In the following figure, the magnet is moved towards the coil with a speed and induced 
. If magnet and coil recede away from one another each moving with speed , the induced 
in the coil will be
In the following figure, the magnet is moved towards the coil with a speed and induced . If magnet and coil recede away from one another each moving with speed , the induced in the coil will be
Physics-General
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A square coil 
lying in 
plane with it’s centre at origin. A long straight wire passing through origin carries a current 
in negative 
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A square coil lying in plane with it’s centre at origin. A long straight wire passing through origin carries a current in negative -direction. The induced current in the coil is
Physics-General
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A six pole generator with fixed field excitation developes an emf of 100 V, when operating at 1500 rpm. At what speed must it rotate to develop 120 V?
A six pole generator with fixed field excitation developes an emf of 100 V, when operating at 1500 rpm. At what speed must it rotate to develop 120 V?
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The number of turns in primary and secondary coils of a transformer is 50 and 200 respectively. If the current in the secondary coil is 4A, then the current in the secondary coil is
The number of turns in primary and secondary coils of a transformer is 50 and 200 respectively. If the current in the secondary coil is 4A, then the current in the secondary coil is
Physics-General
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A uniform rod of mass M = 5 kg and length = 90 cm rests on a smooth horizontal surface. One of the end of the rod is stroke in a horizontal direction at right angles to the rod, importing a linear momentum p = 3 Ns to the rod. During the subsequent motion, the force exerted by one half of the rod on the other half is –
A uniform rod of mass M = 5 kg and length = 90 cm rests on a smooth horizontal surface. One of the end of the rod is stroke in a horizontal direction at right angles to the rod, importing a linear momentum p = 3 Ns to the rod. During the subsequent motion, the force exerted by one half of the rod on the other half is –
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A particle of mass 2 kg is moving with velocity of 2m/s on straight line y = 2x + 1. Its angular momentum about origin is –
A particle of mass 2 kg is moving with velocity of 2m/s on straight line y = 2x + 1. Its angular momentum about origin is –
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The angular momentum of particle of mass 0.01 kg and position vector 
metre and moving with a velocity 
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The angular momentum of particle of mass 0.01 kg and position vector metre and moving with a velocity metre/sec about the origin will be -
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Two wheels P and Q are mounted on the same axle. The moment of inertia of P is 6 kg-m2 and it is rotating at 600 rotations per minute and Q is at rest. If the two are joined by means of a clutch then they combined rotate at 400 rotations per minute. The moment of inertia of Q will be -
Two wheels P and Q are mounted on the same axle. The moment of inertia of P is 6 kg-m2 and it is rotating at 600 rotations per minute and Q is at rest. If the two are joined by means of a clutch then they combined rotate at 400 rotations per minute. The moment of inertia of Q will be -
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A girl sits near the edge of a rotating circular platform. If the girl moves from circumference toward the centre of the platform then the angular velocity of the platform will-
A girl sits near the edge of a rotating circular platform. If the girl moves from circumference toward the centre of the platform then the angular velocity of the platform will-
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A uniform heavy disc is rotating at constant angular velocity () about a vertical axis through its centre O. Some wax W is dropped gently on the disc. The angular velocity of the disc-
A uniform heavy disc is rotating at constant angular velocity () about a vertical axis through its centre O. Some wax W is dropped gently on the disc. The angular velocity of the disc-
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Flywheel is an important part of steam engine because -
Flywheel is an important part of steam engine because -
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A disc of mass 4 kg and of radius 1m rolls on a horizontal surface without slipping such that the velocity of its centre of mass is 10 cm/sec. Its rotational kinetic energy is-
A disc of mass 4 kg and of radius 1m rolls on a horizontal surface without slipping such that the velocity of its centre of mass is 10 cm/sec. Its rotational kinetic energy is-
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