If a coil of 40 turns and area 4.0 cm2 is suddenly removed from a magnetic field, it is obseverd that a charge of
A bar magnet is placed upright on a floor
Lenzs law is consequence of the law of conservatian of
According to phenomenon of mutual inductance
According to the Faradays law of electromagnetic induction
A copper ring is held horizontally and a bar magnet is dropped through the ring with its lenth along the axis of the ring
A coil Having 500 square loops each of side 10cm
A square loop of side 22cm is converted into circular loop in
According to Lenzs law of electromagnetic induction
Two concentric coils each of radius equal to
A Square coil of 10-2 m2 area is placed perpendicular to a uniform magnetic field of intensity
A rectangular, a square, a circular and an elliptical loop
A coil having an area 2m2 is placed in a magnetic field
The north pole of a long horizontal bar magnet is being brought closer
The flux linked with a circuit is given by
The magnetic flux linked with a coil of N turns of area of cross section A held with its plane parallel to the field B is
A copper disc of radius 0.1 m is rotated about its centre with 20 rev/s in an uniform magnetic field of 0.1 T with its plane perpe..
Two coils A and B have mutual inductance 2*10-2 henry. if the current in the primary is i = 5sin(10Ï€ t) then the maximum value..
A circular coil of radius R = 10cm having 500 turns and total resistance 2 is placed initially perpendicular to the earths magneti..
A step-down transformer is used on a 1000 V line to deliver 20 A at 120 V at the secondary coil. If the efficiency of the transfor..
The turn ratio of a transformer is 1 : 2. An electrolytic DC cell of emf 2 V is connected to its primary. The output voltage acros..
A solenoid of inductance 2 H carries a current 1 A. What is the magnetic energy stored in a solenoid ?
What should be the value of self inductance of an inductor that should be connected to 220 V, 50 Hz supply, so that a maximum curr..
The figure shows three circuits with identical batteries, inductors and resistances. Rank the circuits according to the currents t..
In an AC generator, a coil with N turns, all of the same area A and total resistance R, rotates with frequency w in a magnetic fie..
The magnetic field B = 2t + 4t2 (where t = time) is applied perpendicular to the plane
Magnetic flux of 10 u Wb is linked with a coil, when a current of 2mA flows through it. What is the self inductance of the coil ?
A transformer has an efficiency of 80 per. It is connected to a power input of 5 kW at 200 V. If the secondary voltage is 250 V, t..
A six pole generator with fixed field excitation developes an emf of 100 V, when operating at 1500 rpm. At what speed must it rota..
Susceptibility of ferromagnetic substance is
Curie-Weiss law is obeyed by iron
A paramagnetic liquid is taken in a U-tube and arranged so that, one of its limbs is kept between pole pieces of the magnet. The l..
A step-down transformer has 50 turns on secondary and 1000 turns on primary winding. If a transformer is connected to 220 V and 1 ..
The core of a transformer is laminated to reduce
Induction furnace is based on the heating effect of
In 0.1s, the current in a coil increases from 1 A to 1.5 A. If inductance of coil is 60 mH, then induced current in external resis..
The magnetic susceptibility is negative for
A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 A, the efficiency of transfor..
Turn ratio is 1.25. The step-up transformer operates at 230 V and current through secondary is 2 A. Then, current in primary is
A transformer rated at 10 kW is used to connect a 5 kV transmission line to a 240 V circuit. The ratio of turns in the windings of..
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