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The material suitable for making electro...

The material suitable for making electromagnets should have

A

high retentivity and low coercivity

B

low retentivity and low coercivity

C

high retentivity and high coercivity

D

low retentivity and high coercivity

Text Solution

Verified by Experts

The correct Answer is:
b
(b) Electro magnet should be amenable to magnetisation and demagnetization
`therefore` retentivity should be low and coercivity should be low.
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DISHA PUBLICATION-MAGNETISM AND MATTER-EXERCISE-1:CONCEPT BUILDER (TOPICWISE)
  1. If mu(0) is absolute permeability of vacum and mu(r) is relative magn...

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  2. The ferromagnetic core of electromagnets should have

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  3. The material suitable for making electromagnets should have

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  4. The relative permeability of iron is 6000. Its magnetic susceptibilit...

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  5. Which of the following is not correct about relative magnetic permeab...

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  6. The basic magnetization curve for a feromagnetic materials is shown in...

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  7. When a piece of a ferromagnetic sobstance is put in a uniform magnetic...

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  8. The permanent magnet is made fron which one of the following substance...

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  9. Demagnetisation of magnets can be done by

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  10. Nickel shows ferromagnetic property at room temperature. If the temper...

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  11. If a diamagnetic substance is brought near north or south pole of a ba...

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  12. A paramagnetic material is placed in a magnetic field. Consider the fo...

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  13. When a ferromagnetic material is heated to temperature above its Curie...

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  14. The magnetic moment of a magnet (15cmxx2cmxx1cm) is 1.2A-m^(2). Calcul...

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  15. Needles N(1) , N(2), and N(3) are made of a ferromagnetic, a paramagne...

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  16. Three identical bars A, B and C are made of different magnetic materia...

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  17. Relative permitivity and permeability of a material epsilon(r) and mu(...

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  18. IF the current is doubled, the deflection is also doubled in

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  19. To measure the magnetic moment of a bar magnet, one may use

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  20. A bar magnet of moment of inertia 9xx10^(-5) kgm^(2) placed in a vibra...

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