he retentivity (a property) of material is useful for the construction of__________?

Related Mcqs:

1. he retentivity (a property) of material is useful for the construction of_______________?

   A. permanent magnets
   B. transformers
   C. non-magnetic substances
   D. electromagnets

2. The materials having low retentivity are suitable for making_____________?

   A. weak magnets
   B. temporary magnets
   C. permanent magnets
   D. none of the above

3. The commonly used material for shielding or screening magnetism is____________?

   A. copper
   B. aluminium
   C. soft iron
   D. brass

4. Which of the following is a ferromagnetic material ?

   A. Tungsten
   B. Aluminium
   C. Copper
   D. Nickel

5. Indicate which of the following material does not retain magnetism permanently

   A. Soft iron
   B. Stainless steel
   C. Hardened steel
   D. None of the above

6. A material which is slightly repelled by a magnetic field is known as_____________?

   A. ferromagnetic material
   B. diamagnetic material
   C. paramagnetic material
   D. conducting material

7. In a simple magnetic field the strength of magnet flux_______________?

   A. is constant and has same value in energy part of the magnetic field
   B. increases continuously from initial value to final value
   C. decreases continuously from initial value to final value
   D. first increases and then decreases till it becomes zero

8. A permanent magnet______________?

   A. attracts some substances and repels others
   B. attracts all paramagnetic substances and repels others
   C. attracts only ferromagnetic substances
   D. attracts ferromagnetic substances and repels all others

9. The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength ?

   A. 2500 AT/m
   B. 250 AT/m
   C. 25 AT/m
   D. 2.5 AT/m

10. Gilbert is a unit of_______________?

    A. electromotive force
    B. magnetomotive force
    C. conductance
    D. permittivity