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qUESTIONS

MCQs-PYQs-12th-jee

A uniform but time-varying magnetic field B(t) exists in a circular region of radius a and is directed into the plane of the paper, as shown. The magnitude of the induced electric field at point P at a distance r from the centre of the circular region

MCQs-PYQs-12th-jee

A short solenoid of radius a, number of turns per unit length n1, and length L is kept coaxially inside a very long solenoid of radius b, number of turns per unit length n2. What is the mutual inductance of the system

MCQs-PYQs-12th-jee

According to phenomenon of mutual inductance

MCQs-PYQs-12th-jee

A uniform magnetic field is restricted within a region of radius r. The magnetic field changes with time at a rate dB/dt. Loop 1 of radius R > r encloses the region r and loop 2 of radius R is outside the region of magnetic field as shown in the figure below. Then the e.m.f. generated is

MCQs-PYQs-12th-jee

A long solenoid of diameter 0.1 m has 2×104 turn per meter. At the centre of the solenoid, a coil of 100 turns and radius 0.01 m is placed with its axis coinciding with the solenoid axis. The current in the solenoid reduces at a constant rate to 0A from 4A in 0.05 s. If the resistance of the coil is 10π2Ω, the total charge flowing through the coil during this time is

MCQs-PYQs-12th-jee

A conducting square frame of side ‘a’ and a long straight wire carrying current I are located in the same plane as shown in the figure. The frame moves to the right with a constant velocity ‘V’. The emf induced in the frame will be proportional to

A wave in a string has an amplitude of 2 cm. The wave travels in the +ve direction of x axis with a speed of 128 m/sec and it is noted that 5 complete waves fit in 4 m length of the string. The equation describing the wave is

A progressive wave travelling in positive x – direction given by y = a cos(kx – wt) meets a denser surface at x = 0, t=0. The reflected wave is then given by

The wave function (in SI unit) for a light wave is is given as Y(x, t) = 103 sin л(3×106x-9×1014) The frequency of the wave is equal to

The wave described by y = 0.25 sin(10лx-2nt) where x and y are in meters and t in seconds, is a wave travelling along the

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