Class 10 CBSE Magnetic-effect-of electric -current (2).pptx

1. CH. 13:MAGNETIC EFFECTS OF
ELECTRIC CURRENT

2. Topics to be covered:-
1. Introduction to Magnetic effect of electric current
2. Magnet & its properties
3. Magnetic field to a current carrying circular loop
4. Solenoid
5. Electromagnet
6. Force on a current carrying conductor in a magnetic field
&Fleming’s Left hand rule
7. Electric Motor
8. Electromagnetic induction &Fleming’s Right hand rule
9. Generator
10. AC &DC
11. Domestic Electric Circuit
12. Q&A (NCERT and Board Paper)

3. Introduction
The term ‘ magnetic effect of electric current’ means that
an electric current flowing in a wire produces a magnetic
field around it”. In other words electric current produces
magnetism.

6. The figure represents the experimental setup. On passing the
current through the copper wire XY in the circuit, the compass
needle which is placed near the conductor gets deflected. If we
reverse the direction of current, the compass needle deflected in
reverse direction. If we stop the flow of current, the needle
comes at rest.

7. Hence, it concludes that electricity and magnetism are linked to
each other. It shows that whenever the current will flow through
the conductor, then a magnetic field will be developed around it.

8. Magnets
 Magnets are the materials that attracts materials like iron, nickel
and cobalt.
 A freely suspended magnet aligns in the north-south direction.
 The end of the magnet that points in the north direction is called
north seeking end or north pole.
 The end of the magnet that points in the south direction is called
south seeking end or south pole.

9. Magnetic field
It is the region surrounding a magnet, in which force of magnet
can be detected. It is a vector quantity, having both direction &
magnitude.
Magnetic field lines
Magnetic field lines are used to represent magnetic field around
a magnet.

11. Characteristics of Magnetic field lines
1. The direction of magnetic field lines outside the
magnet is always from north pole to south pole of
bar magnet and are indicated by an arrow.
Inside the magnetic, the direction of field lines is
from its south pole to north pole.
Thus magnetic field lines are closed curve.
2. The strength of magnetic field is expressed by the
closeness of magnetic field lines. Closer the lines,
more will be the strength and farther the lines, less
will be the magnetic field strength.

12. 3. The magnetic field lines are closed curved.
4. They repel each other.
5. No two field lines will intersect each other. If
they intersects, then at point of intersection
the compass needle will show two direction of
magnetic field which is not possible.

13. Right hand Thumb Rule:-
Imagine that you are holding the current carrying wire in your right hand so that
your thumb points in the direction of current , then the direction in which your
fingers encircle the wire will give the direction of magnetic field lines around the
wire.

14. A Straight conductor carrying current

15. A circular loop carrying current

17. A solenoid carrying current

18. ELECTROMAGNET
A strong magnetic field inside a solenoid can be used to
magnetize a piece of magnetic material like soft iron
when placed inside a coil. Such a magnet is called an
electromagnet.

19. Force on current carrying conductor
placed in a magnetic field

20. Flemings Left hand rule:-

21. Electric Motor
A motor is a device which converts electrical energy into
mechanical energy.

22. Electromagnetic Induction

23. Electromagnetic Induction using two coils

24. Electric Generator

25. A.C and D.C
Alternating current produced in India has a frequency
of 50 Hz.

26. Domestic Electric Circuits