Advertisements
Advertisements
Question
Can a transformer work when it is connected to a D.C. source? Give a reason.
Solution
No, a transformer cannot work on a d.c. source. With a d.c. source, there will be no change in magnetic flux linked with the secondary coil.
APPEARS IN
RELATED QUESTIONS
State three ways in which the strength of an electromagnet can be increased.
How does an electromagnet differ forma permanent magnet?
Explain why, an electromagnet is called a temporary magnet.
The following diagram shows a fixed coil of several turns connected to a center zero galvanometer G and a magnet NS which can move in the direction shown in the diagram.
- Describe the observation in the galvanometer if
- The magnet is moved rapidly,
- The magnet is kept still after it has moved into the coil
- The magnet is then rapidly pulled out the coil.
- How would the observation in (i) of part (a) change if a more powerful magnet is used?
List some of the practical applications of an electromagnet.
You have been provided with a solenoid AB.
(i) What is the polarity at end A?
(ii) Give one advantage of an electromagnet over a permanent magnet.
Write the two names in the following diagram.
Right hand thumb rule.
There is a uniform magnetic field directed perpendicular and into the plane of the paper. An irregular shaped conducting loop is slowly changing into a circular loop in the plane of the paper. Then ______.