MAGNETIC FIELD

Magnetic field:

                                     The field around the magnetic in which it can attract or repel easily any magnetic material called magnetic field .

                                                                                                                                                           

magneto motive force (magnetic potential)    

where Φ is the magnetic flux and R is the reluctance of the circuit. It can be seen that the magneto motive force plays a role in this equation analogous to the voltage V in Ohm's law: V = IR, since it is the cause of magnetic flux in a magnetic circuit

Units:

Units:

MAGNETIC POLE'S:

                                      In magnetic there are two poles one is north In SI units, B is measured in teslas (symbol: T) and correspondingly ΦB (magnetic flux) is measured in webers (symbol: Wb) so that a flux density of 1 Wb/m2 is 1 tesla. The SI unit of tesla is equivalent to (newton·second)/(coulomb·metre).[nb 6] In Gaussian-cgs units, B is measured in gauss (symbol: G). (The conversion is 1 T = 10,000 G.) One nanotesla is also called a gamma (symbol: γ). The H-field is measured in amperes per metre (A/m) in SI units, and in oersteds (Oe) in cgs unitand other is south they remain always together they can not apart from one an other .They can not exist independently while charges can exist + and - independently easily.

Direction of magnetic field:                                                                                                             THIS FIG DESCRIBE THE DIRECTION OF MAGNETIC FIELD IN ELECTRIC WIRE.                                                                                                                                                    

                           

Electric Field Concept

Electric field:

                                              The field around which a force exerted on charge called field force or electric field.

Formula:                                                                                                                           

                       E = F/Q             ELECTRIC FIELD = FORCE / CHARGE

Sort's of field:

                                  Two type of field 1 magnetic field 2 electric field .

magnetic field is a natural field while electric field is artificial .

PRODUCED:

                               It emits from positive terminal (+ve ) to negative terminal (-ve). Indicated by arrows ......                                                    

Strength:

                     Electric field would be strong when lines are closer to each other .

      

     

Weak :                                               And weak when lines are away from each other. 

Comparison b/w electric field & gravitational field: 

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Technology Image

Electrical images

RESISTANCE CONCEPT

Resistance :

                              The opposition offered by atoms against flow of electron called resistance .You can easily understand from fig.

UNIT:

                                        OHM or Ω 

Formula :

                                             R = V/I   =  VOLT/CURRENT

DEPENDENCE : 

                         RESISTANCE  α   temperature ,R α T

It mean increase of temperature resistance will also increase due to direct relation.

CASE :1(INCREASE)

                 Resistance increase with increase of temperature because increase of temperature the size of atom increases and than probability of collision of electron with atom increase due to this effect resistance increase with increase of temperature .Electron can not pass through metal or wire like this...

this bob can not pass through it due to expansion similarly this case also with electron in metal plate or wire . 

CASE :2(DECREASE)

                                                         Resistance decrease with increase of area of metal or wire with the increase of area the probability of collision of electron with the atom decreases because in large area electron are far away from atoms so they can easily move and can  conduct electricity or heat easily.

VOLTAGE CONCEPT

Voltage:

                     The difference of charges b/w two point's called voltage or potential difference .it is also called emf.

Concept :

                     It is actually push of chargers you can easily understand from fig which given below :

 Explain:

               It's mean how much charges difference between two terminals or point's.

let suppose ; At point A charge is 5 coulomb and at point B is 8 coulomb than their difference is 3 which we says voltage or potential mean 3 volt's .      

Denoted by :

                              V:(VOLTAGE )

Formula:

                         V=IR          V VOLTAGE ,I CURRENT , R RESISTANCE or v= delta E/r      E is a potential gradient is is distance

UNIT: 

          It is unit of potential difference  .

CURRENT AND ITS CONCEPT

CURRENT:

                                                                Flow of charges (positive or negative)  called current.Its unit is ampere .

TYPES OF CURRENT :

                                                              THERE ARE TWO(2) TYPES OF CURRENT :

ELECTRONIC CURRENT:1

                                                              Due to flow of negative(-) charge is called electric current which always flow from negative terminal to positive terminal.

CONVENTIONAL CURRENT:2

                                                              Due to flow of positive(+) charge is called  conventional
current which always flow from positive terminal to negative terminal .

UNIT OF CURRENT :

                                                              It's international unit is ampere(A) which is on the name of scientist who find it.

DENOTED BY:

                                      CURRENT( I )

FORMULA:

                                 I =Q/T     OR CHARGES / TIME TAKEN

CONCEPT OF CURRENT :

                                                               Concept of current we actually taken which force help to rounding a body .

CURRENT RELATION:                                       

                                                      

AFFECT OF CURRENT:

                                                          Current produce heat which cause of burn of instruments due to direct relation with heat.