Advertisements
Advertisements
प्रश्न
State two differences between an electromagnet and a permanent magnet.
Advertisements
उत्तर
| Electromagnet | Permanent magnet |
| It is made up of soft iron | It is made up of steel. |
| The magnetic field strength can be changed. | The magnetic field strength cannot be changed. |
| The electromagnets of very strong field can be made. | The permanent magnets are not so strong. |
shaalaa.com
क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
संबंधित प्रश्न
Name and state the rule by which polarity at the ends of a current carrying solenoid is determined.
What is an electromagnet?
principle of an electric motor ?
State two factors on which the magnitude of an induced e.m.f. in the secondary coils of a transformer depends.
What is an electromagnet?
How does a magnetic field set up by a solenoid change when number of turns are increased?
Why is soft iron generally used as the core of the electromagnet?
State the principle of a D. C. motor.
The primary windings of a step-up transformer are usually made of thicker wire than the secondary. Explain.
Write the answer in your word.
How is an electromagnet made?
