JEE 2020 Physics: Faraday's Law of EMI and Lenz's Law Quiz (05.09.2019) for JEE & BITSAT Exams

Question 1

A small circular loop of wire of radius a is located at the center of a much larger circular wire loop of radius b. The two loops are in the same plane. The outer loop of radius b carries an alternating current

. The emf induced in the smaller inner loop is nearly

Question 2

A closed circuit consists of a source of emf E and an inductor coil of inductance L connected in series. The active resistance of whole circuit is R. At the moment t = 0 the inductance of coil abruptly decreased to

. Then current in the circuit immediately after is -

Question 3

Figure shows a uniform magnetic field B confined to a cylindrical volume and is increasing at a constant rate. The instantaneous acceleration experienced by an electron placed at P is –

Question 4

Some magnetic flux is changed from a coil of resistance 10 ohm. As a result an induced current is developed in it, which varies with time as shown in figure. The magnitude of change in flux through the coil in Webers is-

Question 5

Consider the situation shown in figure. If the switch is closed and after some time it is opened again, the closed loop will show-

Question 6

A square wire loop of 10.0 cm side lies at right angles to a uniform magnetic field of 20T. A 10 V light bulb is in a series with the loop as shown in the figure. The magnetic field is decreasing steadily to zero over a time interval Δt. The bulb will shine with full brightness if Δt is equal to -

Question 7

A circular loop of wire of radius r rotates about z-axis with angular velocity ω. The normal to the loop is always perpendicular to z axis. At t =0 , normal parallel to y axis. An external magnetic field