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qUESTIONS

MCQs-PYQs-12th-jee

A long solenoid has 1000 turns. When a current of 4 A flows through it, the magnetic flux linked with each turn of the solenoid is 4×10-3 Wb. The self inductance of the solenoid is

MCQs-PYQs-12th-jee

Figure shows a circuit that contains three identical resistors with resistance R = 9.0Ω each, two identical inductors with inductance L = 2.0mH each and an ideal battery with emf ε = 18V. The current ‘i’ through the battery just after the switch closed is

MCQs-PYQs-12th-jee

The primary winding of a transformer has 100 turns and its secondary winding has 200 turns. The primary is connected to an ac supply of 120 V and the current flowing in it is 10 A. The voltage and the current in the secondary are

MCQs-PYQs-12th-jee

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 amp, the efficiency of the transformer is approximately

MCQs-PYQs-12th-jee

A transformer connected to 220 volt line shows an output of2 A at 11000 volt. The efficiency is 100%. The current drawn from the line is

MCQs-PYQs-12th-jee

A 220 volt input is supplied to a transformer. The output circuit draws a current of 2.0 ampere at 440 volts. If the efficiency of the transformer is 80%, the current drawn by the primary windings of the transformer is

MCQs-PYQs-12th-jee

A coil having n turns and resistance RΩ is connected with a galvanometer of resistance 4RΩ. This combination is moved in time t seconds from a magnetic field W1 weber to W2 weber .The induced current in the circuit is

MCQs-PYQs-12th-jee

One conducting U tube can slide inside another as shown in figure, maintaining electrical contacts between the tubes. The magnetic field B is perpendicular to the plane of the figure. If each tube moves towards the other at a constant speed v then the emf induced in the circuit in terms of B, I and v where l is the width of each tube, will be

MCQs-PYQs-12th-jee

A rectangular loop has a sliding connector PQ of length l and resistance RΩ and it is moving with a speed u as shown. The set-up is placed in a uniform magnetic field going into the plane of the paper. The three currents I1,I2 and l are

MCQs-PYQs-12th-jee

A short-circuited coil is placed in a time-varying magnetic field. Electrical power is dissipated due to the current induced in the coil. If the number of turns were to be quadrupled and the wire radius halved, the electrical power dissipated would

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