CBSE Class 10 Physics Magnetic effect of Current Notes. Learning the important concepts is very important for every student to get better marks in examinations. The concepts should be clear which will help in faster learning. The attached concepts made as per NCERT and CBSE pattern will help the student to understand the chapter and score better marks in the examinations.
The term magnetic effect of electric current means that an electric current flowing in a wire
produces a magnetic field around it.
A current flowing in a wire always gives rise to a magnetic field around it. The magnetic effect
of current is also called electromagnetism which means electricity produces magnetism. In
figure, the deflection of compass needle by the current carrying wire in the below experiment
show that an electric current produces a magnetic field around it.
A magnet is an object, which attracts pieces of iron, steel, nickel and cobalt. It has two poles at
ends – South and North Pole.
ØLike magnetic poles repel each other.
ØUnlike magnetic poles attract each other.
The space surrounding a magnet in which the force of attraction and repulsion is exerted is
called a magnetic field.
MAGNETIC FIELD LINES
The magnetic field lines are the lines drawn in a magnetic field along which a north magnetic
pole would move. These are also known as magnetic lines of forces.
PROPERTIES OF MAGNETIC FIELD LINES
1. A magnetic field lines originate from north pole and end at its south pole.
2. A magnetic field line is a closed and continuous curve.
3. The magnetic field lines are closer near the poles of a magnet where the magnetic field is
strong and farther apart where the magnetic field is weak.
4. The magnetic field lines never intersect each other.
5. A uniform magnetic field is represented by parallel and equidistant field lines.
INTEXT QUESTIONS PAGE NO. 224
1. Why does a compass needle get deflected when brought near a bar magnet?
Ans. A compass gets deflected due to the forces acting on its poles due to the magnetic
field of the bar magnet.
MAGNETIC FIELD DUE TO A CURRENT THROUGH A STRAIGHT CONDUCTOR
The magnetic field lines around a straight conductor carrying current are concentric circles
whose centres lies on the wire.
The magnitude of magnetic field produced by a straight current carrying wire at a point-
directly proportional to current passing in the wire.
inversely proportional to the distance of that point from the wire.
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