×
Detail Form
We will send your result on your email id and phone no. please fill detail
1.
The time constant of an 
circuit represents the time in which the current in the circuit
circuit represents the time in which the current in the circuit
2.
A conducting circular loop is placed in a uniform magnetic field of induction B tesla with its plane normal to the field. Now, the radius of the loop starts shrinking at the rate 
. Then, the induced emf at the instant when the radius is 
is
. Then, the induced emf at the instant when the radius is is
3.
The current (I) in the inductance is varying with time according to the plot shown in figure
Which one of the following is the correct variation of voltage with time in the coil
Which one of the following is the correct variation of voltage with time in the coil
4.
A transformer has 100 turns in the primary coil and carries 
current. If input power is one kilowatt, the number of turns required in the secondary coil to have 
output will be
current. If input power is one kilowatt, the number of turns required in the secondary coil to have output will be
5.
A circular coil of mean radius of 
and having 400 turns is rotated at the rate of 1800 revolutions per minute in the earth's magnetic field (
gauss), the maximum e.m.f. induced in coil will be
and having 400 turns is rotated at the rate of 1800 revolutions per minute in the earth's magnetic field ( gauss), the maximum e.m.f. induced in coil will be
6.
A circular coil and a bar magnet placed near by are made to move in the same direction. The coil covers a distance of 
in 
and the magnet a distance of 
in 
. The induced emf produced in the coil
in and the magnet a distance of in . The induced emf produced in the coil
7.
A cylindrical bar magnet is kept along the axis of a circular coil. If the magnet is rotated about its axis, then
8.
When power is drawn from the secondary coil of the transformer, the dynamic resistance
9.
The mutual inductance of an induction coil is 
. In the primary coil, the current reduces from 
to zero in 
. What is the induced emf in the secondary coil
. In the primary coil, the current reduces from to zero in . What is the induced emf in the secondary coil
10.
An alternating current of frequency 
peak value 
as shown in the figure, is applied to the primary of a transformer. If the coefficient of mutual induction between the primary and the secondary is 
, the voltage induced in the secondary will be
peak value as shown in the figure, is applied to the primary of a transformer. If the coefficient of mutual induction between the primary and the secondary is , the voltage induced in the secondary will be