NEET Electromagnetic Induction MCQs & PYQs

Two inductances connected in parallel are equivalent to a single inductance of 1.5 H, and
when connected in series are equivalent to a single inductance of 8H. The difference in their
inductance is :

A square loop of side 5 cm enters a magnetic field with 1 cms–1. The front edge enters the
magnetic field at t = 0 then which graph best depicts emf ?

An inductor L, a resistance R and two identical bulbs, B1 and B2 are connected to a battery
through a switch S as shown in the figure. Which of the following statements gives the correct
description of the happenings when the switch S is closed ?

A metallic ring is attached with the wall of a room. When the north pole of a magnet is brought near to it, the induced current in the ring will be

A conducting rod AC of length 4l is rotated about a point O in a uniform magnetic field B directed into the paper AO = l and OC = 3l. Then :-

The mutual inductance between a primary and secondary circuits is 0.5 H. The resistance of the
primary and the secondary circuits are 20Ω and 5Ω respectively. To generate a current of 0.4 A
in the secondary, current in the primary must be changed at the rate of :

Pure inductors each of inductance 3 H are connected as shown. The equivalent induction of
the circuit is :

In an AC generator, a coil with N turns, all of the same area A and total resistance R, rotates with frequency ω in a magnetic field B. The maximum value of emf generated in the coil is :

A wire forming one cycle of sine curve is moved in x-y plane with velocity

\[\overrightarrow{V}=V_{x}\hat{i}+V_{y}\hat{j}\] .
There exist a magnetic field \[\overrightarrow{B}=-B_{0}\hat{k}\] . Find
the motional emf develop across the ends PQ of wire :

The magnetic field in a region is given by

\[\overrightarrow{B}=B_{0}\left( 1+\frac{x}{a} \right)\hat{k}\]
. A square loop of edge – length d is placed with its edge along x & y axis. The loop is moved with constant velocity \[\overrightarrow{V}=V_{0}\hat{i}\]. The emf induced in the loop is