Advertisements
Advertisements
प्रश्न
State two ways of magnetising an iron piece?
Advertisements
उत्तर
The two ways of magnetising an iron piece are:
1. Magnetic induction method:
Take a long iron nail and test it for magnetic properties by bringing near the magnetic substances. You will see nail does not attract the magnetic substances. Now bring near a pole of a bar magnet to the head of the nail. Now bring the iron paper clips near the pointed end of the nail, you will observe that the iron paper clips now get attracted towards the nail. This is because the iron nail has become a magnet. Now take the bar magnet away from the iron nail, paper clips fall off. This magnetism is temporary.
2. Single touch method:
Take a demagnetised piece of iron. Place it on a stable surface. Take a magnet and select its one pole. Now MB it with the selected pole on the iron in one direction several times. After some time, the iron piece turns into a magnet.
APPEARS IN
संबंधित प्रश्न
How will you make an iron bar electromagnet? Draw a diagram showing the polarities of the electromagnet?
Suppose you are given a long bar magnet and you are asked to break it into four small magnets. Draw diagrams showing the polarities of each broken part.
State three uses of an electromagnet?
Answer the following in short.
Name a few common appliances that use electromagnets.
Describe briefly one way of producing an induced current in a coil. State one factor that determines the magnitude of induced e.m.f.
Why is soft iron generally used as the core of the electromagnet?
State the condition when an electric charge can give rise to a magnetic field.
What energy conversion takes place during the working of a d c motor?
State the position of armature coil relative to the direction of magnetic field, in a D. C. motor when the deflecting couple acting and the coil is minimum.
What is dynomo (a.c. generator)? State the principle on which it works.
