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qUESTIONS

MCQs-PYQs-12th-jee

The current carrying wire and the rod AB are in the same plane. The rod moves parallel to the wire with a velocity v. Which one of the following statements is true about induced emf in the rod

MCQs-PYQs-12th-jee

A straight conductor of length 4 m moves at a speed of 10 m/s. When the conductor makes an angle of 30° with the direction of magnetic field of induction of 0.1 Wb. m’ then induced emf is

MCQs-PYQs-12th-jee

At a place the value of the horizontal component of the earth’s magnetic field H is 3×10-5 weber/m2. A metallic rod AB of length 2 m placed in east-west direction, having the end A towards east, falls vertically downward with a constant velocity of 50 m/s2. Which end of the rod becomes positively charged and what is the value of induced potential difference between the two ends

MCQs-PYQs-12th-jee

A wire of length 1 m is moving at a speed of 2 ms-1 perpendicular to its length and in a homogeneous magnetic field of 0.5 T. The ends of the wire are joined to a circuit of resistance 6Ω. The rate at which work is being done to keep the wire moving at constant speed is

MCQs-PYQs-12th-jee

A square loop of wire, side length 10cm is placed at angle of45° with a magnetic field that changes uniformly from 0.17 to zero in 0.7 seconds. The induced current in the loop (its resistance is 12) is

MCQs-PYQs-12th-jee

A coil has an area of 0.05 m2 and it has 800 turns. It is placed perpendicularly in a magnetic field of strength 4×10-5 Wb/m2, it is rotated through 90° in 0.1 sec. The average e.m.f. induced in the coil is

MCQs-PYQs-12th-jee

A coil of area 100 cm2 has 500 turns. Magnetic field of 0.1 weber/metre2 is perpendicular to the both ends of coil. The field is reduced to zero in 0.1 second. The induced e.m.f. in the coil is

MCQs-PYQs-12th-jee

The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a galvanometer. The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when the magnet was

MCQs-PYQs-12th-jee

The diagram below shows two coils A and B placed parallel to each other at a very small distance. Coil A is connected to an ac supply. G is a very sensitive galvanometer. When the key is closed

MCQs-PYQs-12th-jee

If a coil of metal wire is kept stationary in a non-uniform magnetic field, then

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