cbse class 10 science Magnetic effect of elctric current

1. MAGNETIC EFFECT OF ELECTRIC CURRENT
Aditya Mishra
Email: adityakumar2009@gmail.com
Class – 10th (CBSE)
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2. Effects of electric current
Heating effect of electric current :
• When a current is passed through a conductor (wire)
it gets heated .
• This effect of electric current called heating effect of electric
current
Magnet effect of electric current :
• When a current is passed through a conductor (wire)
it behaves like a magnet. (attracts metal objects)
• This effect of electric current is called magnetic effect of electric
current
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3. Discovery of magnet
• A shepherd named Magnus lived in the
ancient city of Greece called Magnesia
• He used to take his herd of sheep and
goats for grazing in the nearby
mountains
• One day the iron stick that he was
carrying got stuck to a rock. He was
unable to pull iron away.
• The rock was natural magnet called
magnetite. It attracted the metal tip of
the stick
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4. Magnet
What is a magnet ?
• An object or material which attracts metal objects are called
magnet.
• A magnet attract metals objects made of iron, steel, cobalt etc.
Magnet
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5. Types of magnet
Natural magnet Artificial magnet
Types of magnet
• A magnet that occurs naturally
in nature is called a natural
magnet
e.g. Lodestone also called magnetite
• A magnet that is made by man
is called artificial or man made
magnet
1 2
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6. Poles of a Magnet
Pole of a magnet:
• Region near the ends of a magnet where the force of attraction
is strongest is called a pole
N – North pole
S – South pole
• Every magnet has two poles a North pole and a South pole
• Therefore a magnet is also called Di -pole ( Di means two )
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7. Poles of a Magnet
How to find the poles of a magnet?
• When a magnet is freely suspended
• Tied to string with paper sling
• It comes to rest pointing in North and
south direction of earth
North pole
of Earth
South pole
of Earth
N
N - North seeking pole or North pole
S - South seeking pole or South pole
S
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8. Magnetic force :
• Force exerted by a magnet on another magnet or by a magnet
on a piece of iron
• Can be attraction or repulsion
Magnetic force
• Like poles always repel each other
• Unlike poles always repel each other
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