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Popular Questions
- 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..
- A Square coil of 10-2 m2 area is placed perpendicular to a uniform magnetic field of intensity
- A magnet is brought towards a coil (i) speedly (ii) slowly, then the induced e.m.f./induced charge will be respectively
- 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
- The magnetic flux through a circuit of resistance R changes by an amount ΔΦ in time Δt
- A cylindrical bar magnet is kept along the axis of a circular coil. If the magnet is rotated about its axis,then
- 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 ?
- The magnetic susceptibility of a paramagnetic substance at -73 degree C is 0.0060, then its value at -173 degree C will be
- A conducting circular loop is placed in a uniform magnetic field 0.04 T with its plane perpendicular to the magnetic field
- in a series lcr circuit, r =200 and the voltage and the
- A straight strip has magnetic moment M. If bent as a semicircle, the magnetic moment of the strip will be
- A step-down transformer, transforms a supply line voltage of 2200 V into 220 V. The primary coil has 5000 turns. The efficiency an..
- 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..
- a square metal wire loop of side 10 cms
- A coil having an area 2m2 is placed in a magnetic field
- 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..
- A bar magnet is placed upright on a floor
- 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..
- 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..
- 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
- 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 six pole generator with fixed field excitation developes an emf of 100 V, when operating at 1500 rpm. At what speed must it rota..
- an lcr circuit is equivalent to a damped pendulum.in an LCR
- A coil Having 500 square loops each of side 10cm
- 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..
- 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 ?
- According to phenomenon of mutual inductance
- A square loop of side 22cm is converted into circular loop in
- A solenoid of inductance 2 H carries a current 1 A. What is the magnetic energy stored in a solenoid ?
- The figure shows three circuits with identical batteries, inductors and resistances. Rank the circuits according to the currents t..
- 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..
- The time period of a freely suspended bar magnet in a field is 2s. It is cut into two equal parts along its axis, then the time pe..
- Two concentric coils each of radius equal to
- 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 ..
- 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 susceptibility of a certain magnetic material is 400 . What is the class of the magnetic material ?
- 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..
- an inductor
