chapter three intourdctoin

Question 1

what is orested discoverd

Answer 1

discoverd that magnetism could be produced by an electric current

Question 2

extranl magnetic filed + electric current =

these used

extrnal magnetic filled + Motion =

these used

Answer 2

1. Motion
2. this used in the elctric motor to change the electric energy into mechanical energy
3. induced electric current
4. this is used in the elctric generator ( dynamo ) to change the mechanical energy into electric energy

Question 3

what is the type of

magnet

elctricty and diff

Answer 3

1. permanent magnet , electric magnet

• changing the chemical energy into electric energy ( battery ) ( DC )
• changing the mechanical energy into electric energy ( Dynamo ) ( AC )

Question 4

diff electro magnetic induction

Answer 4

it is the phenomenon which electromotive force and may an electric current is indused in a conductor if there is a vartion increases or decreases of the magnetic flux linked with the conductor

Question 5

why conductor not indused electro motive force if the conductor in equliprium

Answer 5

because there is no varIATION IN MAGNETIC FLUX LINES LINKED WITH IT

Question 6

what is the condation to let the electric current intinesty induced to flow

Answer 6

if there is a closed circuit

Question 7

what will happen when you moves of a conductor prpendculer at magnetic filed inside and out side

Answer 7

that causes the electrons of the consuctor will accumulated at one of itis end so it is will be –ve and the other end will be +ve due to decreasing of electrons that will generates electro motive force and if there terminals connected with a closed circuit the electric current wi flow