Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
22 Cards in this Set
- Front
- Back
|
What is electromagnetic induction |
The phenomenon of induction of EMF in a circuit due to change in magnetic flux linked with it |
|
|
Magnetic flux |
Over an area is the total number of magnetic field lines of induction passing through that area normally when placed in that magnetic field |
|
|
Magnetic flux dimensional formula |
Is denoted by Def Scalar or vector Negative and positive flux
|
|
|
Magnetic flux SI UNIT |
Weber= Tesla metre2 |
|
|
Magnetic flux cgs unit |
Maxwell |
|
|
I Maxwell= ?tesla |
10^(-8) |
|
|
Faraday's laws of emi |
First law Second law |
|
|
What is Faraday's first law related to |
Production of emf |
|
|
Faraday's second law related to |
"magnitude of EMF" |
|
|
Statement of Faraday's first law |
"Whenever there's a change in magnetic flux linked with a coil/circuit, an induced emf develops in it which lasts so long as the change in mf continues." |
|
|
F's second law |
"the magnitude of induced emf is directly proportional to the rate of change of magnetic flux linked with the coil. How quickly the flux changes determines the magnitude of induced emf. Quicker the change in flux, greater will be the (magnitude) emf generated int the coil" |
|
|
Lenz's law gives |
The direction of induced current in a circuit |
|
|
Lenz's law statement |
Direction of IC is such that it opposes the change that is producing it If current is induced due to motion of magnet then the induced current in coil sets itself to stop the motion of the magnet. |
|
|
Self induction definition |
The phenomenon of production of induced current in a coil when a changing emf passes through it. (The direction of induced current is given in accordance with lenz's law) |
|
|
Mutual induction definition |
The phenomenon of production of induced current in a coil due to the change in current in the neighboring coil. |
|
|
Coefficient of self inductance is denoted and given by |
'L' |
|
|
Coefficient of self induction is aka |
Self-inductance |
|
|
Self inductance may be defined as |
The induced emf set up in a coil when rate of change of current is unity. |
|
|
Self inductance formula |
It is also given by phi/I It is numerically equal to the magnetic flux linked with the coil when unit current passes through it |
|
|
Self inductance of long solenoid depends on |
•N² (number of turns in the coil) •A(area of cross section of the solenoid) •U°(permeability of medium) • l length of the coil(probably) |
|
|
Define 1 henry |
Self inductance of a coil is said to be 1 Henry if an induced emf of 1 volt is set up in it when current through it changes @1A/s |
|
|
SI unit of self inductance |
1 Wb/A or Vs/A Dimension |
