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qUESTIONS

Two periodic waves of intensities I and I2 pass through a region at the same time in the same direction. The sum of the maximum and minimum intensities is

A wire of resistance 12 ohms per meter is bent to form a complete circle of radius 10 cm. The resistance between its two diametrically opposite points A and B as shown in the figure, is [2009]

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

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 The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly.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

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

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 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 circular coil of radius R = 10cm having 500 turns and total resistance 22 is placed initially perpendicular to the earth’s magnetic field of 3×10-5T. The coil is rotated about its vertical diameter by an angle 2m in 0.5 seconds. The induced current in the coil is

MCQs-PYQs-12th-jee

A cylindrical bar magnet is rotated about its axis. A wire is connected from the axis and is made to touch the cylindrical surface through a contact. Then,

MCQs-PYQs-12th-jee

A simple pendulum with bob of mass m and conducting wire of length L swings under gravity through an angle 20. The earth’s magnetic field component in the direction perpendicular to swing is B. Maximum potential difference induced across the pendulum is

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