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The materials suitable for making electromagnets should have (A) high retentivity and high coercivity (B) low retentivity and low coercivity (C) high retentivity and low coercivity (D) low retentivity and high coercivity ?

The materials suitable for making electromagnets should have (A) high retentivity and high coercivity (B) low retentivity and low coercivity (C) high retentivity and low coercivity (D) low retentivity and high coercivity ?

Grade:12

4 Answers

Om Khandade
34 Points
4 years ago
b

Electromagnets are used to turn on and off. This is opposed to permanent magnets that are desired to remain magnetic all the time. Low coercivity means that it requires low magnetic field thus low opposite current to bring it back to the non-magnetic state. Low retentivity means that it becomes a weak magnet when the current is turned off, ideally zero retentivity. all of these features are necessary for the typical application: pick up iron-like metals while the current is on and drop them when the current is off.

 
 
Ashish Kumar
21 Points
3 years ago
Ans:- C
Electromagnets are made up of soft iron. The soft iron has high retntivity and low corectivity.
Anuj Dubey
7 Points
3 years ago
ANS:C 
Electromagnets are made of soft iron .the soft iron is having high retentivity and low coercivity
Pratik Ranjan
15 Points
2 years ago
Ans. --B
The material suitable foe making electromagnet is
(1)- High permeability
(2)- Low coercivity
(3)- Low retentivity

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