Question

(a) With the help of diagram, explain the working of an electromagnet. Write it's uses.
(b) State the factors on which the strength of magnetic field at a point due to a current carrying conductor depends. State the rule which gives the direction of magnetic field.

Answer 1

a) The magnetic field at a point due to a current carrying conductor depends on the current through the conductor & the distance of the point from conductor. An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. Electromagnets usually consist of insulated wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole in the center of the coil. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferromagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet. The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field. Electromagnets are widely used as components of other electrical devices, such as motors, generators, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment. Electromagnets are also employed in industry for picking up and moving heavy iron objects such as scrap iron and steel. View diagram in net or science text book 
b)i)    The magnitude of the magnetic field produced at a given point is directly  proportional to the magnitude of the current passing through the conductor. ii)         The magnetic field produced by a given current in the conductor decreases as the distance from the conductor increases.
magine you are holding a current carrying straight conductor in your right hand such that the thumb points towards the direction of current, then the curled fingers around the conductor will give the direction of the magnetic field.
All these answers are from the science text book plz readt he book as its very useful and easy best of luck for our boards

Answer 2

Hey


( a ) With the help of diagram , explain the working of electromagnet . Write it's uses .


Ans :- Electromagnet is a type of magnet in which magnetic property comes due to the current .

If there is change in the position of current with respect to the conductor , then it produces magnetic effect .


An electromagnet is a simple magnet in which an iron rod is put inside a coil of insulated copper wires . And when current is passed through that coil , then it behaves like magnet and the iron which is in contact of coil also behaves like magnet .

The uses of electromagnet :-

>> It is used in the speakers .

>> It is used in television .

>> It is used in phone .

>> It is used in AC generator .

>> It is used in research centres .


( b ) State the factor on which the strength of magnetic field at a point due to current carrying conductor depends . State the rule which gives the direction if magnetic field .


Ans :- The factors on which the strength of current carrying conductor depends are :-

>> The number of loops / coils made on the iron rod .

The greater the number of loops , the greater the magnetic effect .


>> Amount of electric current passing through the conductor .

Higher the amount of current , greater the magnetic strength .


The rule which is used to find the direction of magnetic field is :-

# Maxwell's Right hand thumb rule

It is also known as

# Maxwell's Corkscrew Rule .



thanks :)