explain how we can obtain the magnetic field due to current in a loop
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The magnetic field around a straight current carrying conductor or wire can be increased by bending the wire into circular loop.
A circular loop is made up of large number of very small straight wires.A magnetic field is produced by an electric current flowing through a circular coil of wire.Each small section of current carrying wire contributes to magnetic field lines.
At the centre of circular wire,field lines become straight and perpendicular to the plane of coil.Right hand thumb rule is used to determine the direction of magnetic field produced due to current carrying circular wire.
Factors on which magnetic field produced at centre of a current carrying circular wire depends are:
1)The amount of current flowing through wire
If current is increased then deflection of needle of magnetic compass placed inside wire also increases.
Strength of magnetic field is directly proportional to current.
2)Radius of circular wire
Strength of magnetic field is inversely proportional to radius of circular wire.
The deflection of needle of magnetic compass placed at the centre of circular wire of smaller radius is more than that placed at centre of circular wire of larger radius.
3)Number of turns in circular wire
If number of turns in circular wire are increased,Magnetic field at the centre of loop increases.
A circular loop is made up of large number of very small straight wires.A magnetic field is produced by an electric current flowing through a circular coil of wire.Each small section of current carrying wire contributes to magnetic field lines.
At the centre of circular wire,field lines become straight and perpendicular to the plane of coil.Right hand thumb rule is used to determine the direction of magnetic field produced due to current carrying circular wire.
Factors on which magnetic field produced at centre of a current carrying circular wire depends are:
1)The amount of current flowing through wire
If current is increased then deflection of needle of magnetic compass placed inside wire also increases.
Strength of magnetic field is directly proportional to current.
2)Radius of circular wire
Strength of magnetic field is inversely proportional to radius of circular wire.
The deflection of needle of magnetic compass placed at the centre of circular wire of smaller radius is more than that placed at centre of circular wire of larger radius.
3)Number of turns in circular wire
If number of turns in circular wire are increased,Magnetic field at the centre of loop increases.
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