A permanent magnet______________?

Related Mcqs:

1. The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields______________?

   A. meter is surrounded by strong magnetic fields
   B. a soft iron shielding is used
   C. a plastic shielding is provided
   D. a shielding of anon-magnetic material is used

2. The use of permanent magnets is. not made in_____________?

   A. magnetoes
   B. energy meters
   C. transformers
   D. loud-speakers

3. Core of an electromagnet should have____________?

   A. low coercivity
   B. high susceptibility
   C. both of the above
   D. none of the above

4. The bar magnet has____________?

   A. the dipole moment
   B. monopole moment
   C. A. and B. both
   D. none of the above

5. What will be the current passing through the ring shaped air cored coil when number of turns is 800 and ampere turns are 3200 ?

   A. 2
   B. 4
   C. 6
   D. 8

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

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

7. When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle?

   A. will be zero
   B. will be infinite
   C. will depend on the amount of e.m.f. applied
   D. will depend on the radius of the circle

8. Which of the following is the unit of magnetic flux density ?

   A. weber
   B. lumens
   C. tesla
   D. none of the above

9. The left hand rule correlates to______________?

   A. current, induced e.m.f. and direction of force on a conductor
   B. magnetic field, electric field and direction of force on a conductor
   C. self induction, mutual induction and direction of force on a conductor
   D. current, magnetic field and direction of force on a conductor

10. When an iron piece is placed in a magnetic field_____________?

    A. the magnetic lines of force will bend away from their usual paths in order to go away from the piece
    B. the magnetic lines of force will bend away from their usual paths in order to pass through the piece
    C. the magnetic field will not be affected
    D. the iron piece will break