Polarity of an Electromagnet
Trending Questions
The north-south polarities of an electromagnet can be found easily by using:
What is an electromagnet? State its uses.
The north-south polarities of an electromagnet can be found directly by using
clock rule
Left-hand thumb rule
Fleming's right-hand rule
Fleming's left-hand rule
Name the following :
Its magnetic property is due to the flow of electric current.
. Steel is preferred for making permanent magnets where as soft iron is preferred for making
electromagnet . Give one reason .
Type of magnet used in removimg iron object from scrap.
The advantages of electromagnet over a permanent magnet is/are
Ectromagnet's magnetic strength can be changed.
The polarity of an electromagnet can be changed.
Electromagnet cannot be easily demagnetized.
Electromagnet produces a permanent magnetic field.
The visual below give the simple circuit used to make an electromagnet. Examine the visual and answer the question that follows:-
What would you observe if you replace Iron nails with an identical Steel nail?
Electromagnets do not get demagnetised on switching off current.
- True
- False
(b) Explain why, an electromagnet is called a temporary magnet.
(c) Explain why, the core of an electromagnet should be of soft iron and not of steel.
(d) State the factors on which the strength of an electromagnet depends. How does it depend on these factors?
(e) Write some of the important uses of electromagnets.
The north-south polarities of an electromagnet can be found easily by using
Fleming's left-hand rule
Fleming's right-hand rule
Clock rule
Left-hand thumb rule
An electromagnet is a permanent magnet.
- True
- False
