Advertisements
Advertisements
प्रश्न
What is a permanent magnet? Give one use of it.
Advertisements
उत्तर
A permanent magnet is a magnet made from steel such that once magnetized, it does not lose its magnetism easily. Use: It is used in the galvanometer.
संबंधित प्रश्न
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.
Tick the most appropriate answer.
Which of the following methods is used to magnetize a magnetic without touching it by a magnet?
State three uses of an electromagnet?
State two differences between an electromagnet and a permanent magnet.
Name the type of transformer shown in Fig. What changes will you observe regarding the brightness of the lamp, if
- the number of turns in the secondary is doubled? Explain.
- the part X of the transformer is removed?
- the core of the transformer is made out of copper?
- the A.C. supply is replaced by D.C.?
The magnetic flux through a coil having 100 turns decreases from 5 milli weber to zero in 5 second. Calculate the e.m.f. induced in the coil.
Describe a simple Experiment to demonstrate that there Exists a magnetic field around a current-carrying conductor.
What will be the effect on the working of an electric bell if instead of a direct current an alternating current is used?
What are the factors that govern the magnitude of force acting on a current carrying conductor which is freely suspended in a magnetic field?
Which magnet will you use?
Iron is to be separated from trash.
