Advertisements
Advertisements
Question
What is an electromagnet?
Advertisements
Solution 1
The magnetic field produced due to the current flowing in a coil or a solenoid can be used to magnetize a material like soft iron temporarily. The insulated copper wire is wrapped on a soft iron piece. When current is passed through the coil using a battery and a key the iron piece behaves like a bar magnet as long as the current is being passed. Such a magnet is called an electromagnet.
Solution 2
An electromagnet is a temporary magnet which behaves as a magnet when electric current is passed through the insulated copper wire and loses its magnetism when current is stopped. It has a soft iron piece called the core with an insulated copper wire wound on it.
Notes
Student can refer to the provided solution based on their preferred question or marks.
APPEARS IN
RELATED QUESTIONS
A metal rod `1/sqrtpi `m long rotates about one of its ends perpendicular to a plane whose magnetic induction is 4 x 10-3 T. Calculate the number of revolutions made by the rod per second if the e.m.f. induced between the ends of the rod is 16 mV.
When a bar magnet is pushed towards (or away) from the coil connected to a galvanometer, the pointer in the galvanometer deflects. Identify the phenomenon causing this deflection and write the factors on which the amount and direction of the deflection depends. State the laws describing this phenomenon.
In which of the following case does the electromagnetic induction occur?
The current is stopped in a wire held near a loop of wire .
Name the following diagram and explain the concept behind it.
Answer the following:
State the principles of the electric motor and electric generator.
State the purpose of soft iron core used in making an electromagnet.
Observe the given figure of Fleming’s Right Hand Rule and write the labels of A and B correctly.
For making a strong electromagnet the material of the core should be ______.
What is the current produced in a coil due to electromagnetic induction called?
