All you wanted to know about electromagnetic induction

1. Delhi Public School
Vindhyanagar

2. CONTENTS :-

3. It is a matter of great pleasure & pride for us to introduce
you all this Physics presentation on
“Electromagnetic Induction”. This project has not only
helped us understand the topic clearly but also
developed & sharpen our skills.
We would like to thank our teacher Mrs. R. Mishra
for this interesting project. It is her inspiration that has
encouraged us to bring up this presentation. We hope,
with our earnest efforts, this project will surely express
our understanding towards the subject.

5. The process, by which a changing
magnetic field in a conductor induces a
current in another conductor, is called
electromagnetic induction.

6. An experiment to show electromagnetic
induction by the means of a magnet
 Take a coil of wire AB having a large number of turns.
 Connect the ends of the coil to a galvanometer as shown in figure.
 Take a strong bar magnet ands move its north pole towards the ends B of the coil.
 There is momentary deflection in the needle of the galvanometer, say to the left. This indicates the
presence of a current in coil AB. The deflection becomes zero the moment the motion of the magnet
stops.
 Now withdraw the north pole of the magnet away from the coil. Now the galvanometer is deflected
toward the right, showing that the current is now set up in the direction opposite to the first.
 Place the magnet stationary at a point near to the coil, keeping it’s north pole towards the end B of
the coil. We see that the galvanometer needle deflects towards the right when the coil is moved
towards the magnet. Similarly the needle moves towards left when the coil is moved away.
 When the coil is kept stationary with respect to the magnet, the deflection of the galvanometer drops
to zero.
 It is, thus, clear from the activity that motion of a magnet with respect to the
coil produces an induced potential difference, which sets up an induced
electric current in the circuit.
G
A B

7. FLEMING’S RIGHT HAND RULE
Magnetic
Field
Movement of
conductor
Induced
current
90°
90°
90°
According to this rule-
Stretch the thumb, forefinger ands middle
finger of right hand so that they are
perpendicular to each other, as shown in
figure.
If the forefinger indicates the direction of the
magnetic field and the thumb shows the
direction of motion of conductor, then the
middle finger will show the direction of
induced current.
This rule helps to find the direction of induced current.

8. Electric Generator
Based on the phenomenon of electromagnetic
induction, the experiments studied generate
induced current, which is usually very small.
This principle is also employed to produce
large currents for use in homes & industry. In
an electric generator, mechanical energy is
used to rotate a conductor in a magnetic field
to produce electricity.

9. Hope you all have enjoyed through the ppt. To make this
ppt we have taken help from our elders, teachers,
library and of course - Internet .
Made and presented by-
Divyansh Thada
Swapnil Netam
Saket Sahu
Thanks to everyone for your patience viewing.
X-B