Physics-
General
Easy
Question
A current passing through a coil of self inductance of 2mH changes at the rate of 20
. The emf induced in the coil is
The correct answer is:
By Faraday’s second law, induced emf
Related Questions to study
Physics-
In an oscillations of 
-
circuit, the maximum charge on the capacitor is 
. The charge on the capacitor, when the energy is stored equally between the electric and magnetic field is
In an oscillations of - circuit, the maximum charge on the capacitor is . The charge on the capacitor, when the energy is stored equally between the electric and magnetic field is
Physics-General
Physics-
The magnitude of the earth’s magnetic field at a place is 
and the angle of dip is 
. A horizontal conductor of length 
lying magnetic north-south moves eastwards with a velocity
. The emf induced across the conductor is
The magnitude of the earth’s magnetic field at a place is and the angle of dip is . A horizontal conductor of length lying magnetic north-south moves eastwards with a velocity. The emf induced across the conductor is
Physics-General
Physics-
In an induction coil with resistance, the induced emf will be maximum when
In an induction coil with resistance, the induced emf will be maximum when
Physics-General
Physics-
A magnet N-S is suspended from a spring and when it oscillates, the magnet moves in and out of the coil C. The coil is connected to a galvanometer G. Then, as the magnet oscillates
A magnet N-S is suspended from a spring and when it oscillates, the magnet moves in and out of the coil C. The coil is connected to a galvanometer G. Then, as the magnet oscillates
Physics-General
Physics-General
Physics-
Energy associated with a moving charge is due to
Energy associated with a moving charge is due to
Physics-General
Physics-
Shown in the figure is a circular loop of radius 
and resistance 
. A variable magnetic field of induction 
is established inside the coil. If the key (
) is closed, the electrical power developed right after closing the switch is equal to
Shown in the figure is a circular loop of radius and resistance . A variable magnetic field of induction is established inside the coil. If the key () is closed, the electrical power developed right after closing the switch is equal to
Physics-General
Physics-General
Physics-
In a circuit with a coil resistance 
, the magnetic flux changes from 
to 
in 0.2 second. The charge that flows in the coil during this time is
In a circuit with a coil resistance , the magnetic flux changes from to in 0.2 second. The charge that flows in the coil during this time is
Physics-General
Physics-
The current through choke coil increases from zero to 6 
in 
and an induced e.m.f. of 30 
is produced. The inductance of the coil of choke is
The current through choke coil increases from zero to 6 in and an induced e.m.f. of 30 is produced. The inductance of the coil of choke is
Physics-General
Physics-
A 50 
ac current of peak value 2 A flows through one of the pair of coils. If the mutual inductance between the pair of coils is 150 
, then the peak value of voltage induced in the second coil is
A 50 ac current of peak value 2 A flows through one of the pair of coils. If the mutual inductance between the pair of coils is 150 , then the peak value of voltage induced in the second coil is
Physics-General
Chemistry-
For the reaction, 
the equilibrium concetratio of 
and HI are 8.0, 3.0 and 28.0 mol/L respectively. The equilibrium constant of the reaction is
For the reaction, the equilibrium concetratio of and HI are 8.0, 3.0 and 28.0 mol/L respectively. The equilibrium constant of the reaction is
Chemistry-General
Chemistry-
In the reaction, 
is that part of 
which dissociates, then the number of moles at equilibrium will be
In the reaction, is that part of which dissociates, then the number of moles at equilibrium will be
Chemistry-General
Chemistry-
According to Le-Chatelier principle, adding heat a solid and liquid in equilibrium will cause the
According to Le-Chatelier principle, adding heat a solid and liquid in equilibrium will cause the
Chemistry-General
Chemistry-
The gaseous reaction, 
is most favoured at
The gaseous reaction, is most favoured at
Chemistry-General
Chemistry-
The total number of different kind of buffers obtained during the titration of 
with 
are:
The total number of different kind of buffers obtained during the titration of with are:
Chemistry-General
Chemistry-
The 
value of 
is 5. Calculate the pH of the buffer solution, 1 L of which contains 0.01 M 
The value of is 5. Calculate the pH of the buffer solution, 1 L of which contains 0.01 M
Chemistry-General
