Rankers Physics

Magnetic Properties of Matter: Practice Problem & Solution

29. Electromagnets are made of soft iron because soft iron has: (2010 Pre)
High retentivity and low coercive force
Low retentivity and high coercive force
High retentivity and high coercive force
Low retentivity and low coercive force

Short Solution (Best for NEET):

To solve this problem, we apply the core principles of Magnetic Properties of Matter. Understanding the underlying formula is key to arriving at the correct answer below:

Electromagnets require a material that gets magnetized easily and quickly loses its magnetism when the current is turned off. Soft iron is ideal because it has low retentivity and low coercive force.

Leave a Reply

Your email address will not be published. Required fields are marked *

Similar Practice Questions

Explore conceptually related problems to test your knowledge.

1. 18. The work done in turning a magnet of magnetic moment $M$ by an angle of $90^{\circ}$ from the meridian, is $n$ times the corresponding work done to turn it through an angle of $60^{\circ}$. The value of $n$ is given by (1995)
2. Assertion (A): To produce high magnetic moment from a current carrying cable, it should be turned in maximum number of circular loops. Reason (R): Magnetic moment is directly proportional to number of turns of circular loop for a given length of wire.  
3. 22. There are four light weight rod samples A, B, C, D separately suspended by threads. A bar magnet is slowly brought near each sample and the following observations are noted: (i) A is feebly repelled (ii) B is feebly attracted (iii) C is strongly attracted (iv) D remains unaffected Which one of the following is true? (2011 Pre)
4. The magnetic materials having negative magnetic susceptibility are:
5. A positively charged particle moving due East enters a region of uniform magnetic field directed vertically upwards. This particle will (1997)