For the formation of permanent magnets, the material should have
Correct answer: A. High coercivity
- A. High coercivity
- B. Low coercivity
- C. Low retentivity
- D. Both (a) and (c)
Explanation
A permanent magnet must be able to resist demagnetizationfrom external fields. This property is called coercivity, and ahigh coercivity is essential for a magnet to maintain itsmagnetism over time.
Last updated
Related questions
A 4.0 m long wire is subjected to stretching force and its length increases by 40 cm. The percent elongation which the wire undergoes is:
A ball falling in a lake of 200 m shows a decrease of 0.1% in its volume. The bulk modulus of elasticity of the material of the ball is: (take g = 10 m/s²)
A ball falling in a lake of 200 m shows a decrease of 0.1% in its volume. The bulk modulus of elasticity of the material of the ball is: (take g =10 m/s2)
A block weighing 40 kg extends a spring by 0.16m from its unscratched position. What is the value of k?
A body floats in a liquid contained in a beaker. The whole system, as shown, falls freely under gravity. The upthrust on the body due to the liquid is: