Material A gets magnetised under the influence of external magnetic field while material B does not get magnetised. Material A retains the acquired magnetism for a long time. Material C magnetises under the influence of a magnetic field and does not retain it for a long time. Which of them is the most suitable to make electromagnets?
Material A gets magnetised under the influence of external magnetic field while material B does not get magnetised. Material A retains the acquired magnetism for a long time. Material C magnetises under the influence of a magnetic field and does not retain it for a long time. Which of them is the most suitable to make electromagnets?
The correct option is D C
Electromagnets are temporary magnets, we should use materials which have high ability to get magnetised under the influence of the magnetic field and low ability to retain the acquired magnetism.
It is given that B does not magnetise under the influence of a magnetic field and A retains the acquired magnetism for a long time. Hence, A and B should not be used to make electromagnets.
It is also given that C magnetises under the influence of a magnetic field and does not retain it for a long time. Hence, C is the most suitable material to make electromagnets.
C
Electromagnets are temporary magnets, we should use materials which have high ability to get magnetised under the influence of the magnetic field and low ability to retain the acquired magnetism.
It is given that B does not magnetise under the influence of a magnetic field and A retains the acquired magnetism for a long time. Hence, A and B should not be used to make electromagnets.
It is also given that C magnetises under the influence of a magnetic field and does not retain it for a long time. Hence, C is the most suitable material to make electromagnets.
