Electromagnetism

Front 1

Electric field

Back 1

Region of space where a charge will experience a electric force

Front 2

Coulombs law

Back 2

The electric force experienced by an object is directly proportional to the product of their charges and inversely proportional to the square of distance between them

F=qQ/4()er^2

Front 3

Electric field strength

Back 3

Electrostatic force per unit charge experienced

Small positive test charge

Points to direction of the force

Front 4

Electric potential energy

Back 4

Of charge at a point is the work done by external force in bringing the charge from infinity to a point in an electric field

Front 5

Electric potential

Back 5

Work done by external agent in bringing a unit point positive charge from infinity to a point in an electric field without any acceleration

Front 6

Potential difference

Back 6

Between two points is Work done by external agent in bringing a unit positive charge from lower potential to higher potential

Front 7

Electron volt

Back 7

Change in energy of an electron that is accelerated or accelerated through a potential difference of 1volt

Front 8

Work done and potential relationship

Back 8

Change in V=wd×q

Front 9

Equipotential lines

Back 9

Locus of point having same potential

Move from various point no work done as no change in potential

Front 10

Parallel plates electric field strength

Back 10

E=change in potential/d

d is Distance between plates

Front 11

Magnetic field

Back 11

Region in which a moving change or a current carrying conductor experiences a magnetic force

Front 12

Force on current carrying conductor

Back 12

F=BILsin■

■ is angle between current and magnetic flux

Front 13

Magnetic flux density ,B

Back 13

Magnetic force acting per unit length of an electrical conductor carry unit current placed at right angles to the magnetic field

Front 14

1 Tesla

Back 14

magnetic flux density of a uniform field when wire carry current of 1A is place perpendicular to the magnetic field experiences a force of 1N perpendicular to both the current and magnetic field

Front 15

Current and velocity eqn

Back 15

I=Q/t

v=l/t

Front 16

Force on a moving change

Back 16

F=BQv

Front 17

Condition for helical motion

Back 17

Enter magnetic field at an oblique angle

Front 18

Hand rules

Back 18

Fleming left hand rule

Right hand screw rule

Front 19

Magnetic flux

Back 19

Product of the magnetic flux density normal to the surface and area A of the surface

♤=BA

Front 20

Webber

Back 20

A Weber is the flux of a magnetic field of magnetic flux density 1tesla perpendicular to an area of 1m^2

Front 21

Magnetic flux linkage

Back 21

Product of magnetic flux though a single coil and total number of coils in the solenoid

♧=NBAcos

Front 22

Faraday law

Back 22

The emf induced in a coil is directly proportional to the rate of change of magnetic flux linkage that links with the coil

Front 23

Lenz law

Back 23

Polarity of the induced emf is in the direction of where and induced current produces a magnetic field that opposes the change in flux producing it

Front 24

3 ways to induce emf

Back 24

Change area enclosed

Change flux density

Change orientation of coil

Front 25

Emf of movable rod

Back 25

Emf=BLv