The materials are a bit inferior conductors of magnetic flux than air

Related Mcqs:

1. Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per meter of length of each conductor will be_____________?

   A. 100 N
   B. 10 N
   C. 1 N
   D. 0.1 N

2. What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m ?

   A. 2 AT
   B. 4 AT
   C. 6 AT
   D. 10 AT

3. The stray line of magnetic flux is defined as_____________?

   A. a line vertical to the flux lines
   B. the mean length of a ring shaped coil
   C. a line of magnetic flux in a non-uniform field
   D. a line of magnetic flux which does not follow the designed path

4. A 200 turn coil having an axial length of 30 mm and a radius of 10 mm is pivoted in a magnetic field having a flux density of 0.8 T. If the coil carries a current of 0.5 A, the torque acting on the coil will be_____________?

   A. 8 N-m
   B. 0.48 N-m
   C. 0.048 N-m
   D. 0.0048 N-m

5. A 300 mm long conductor is carrying a current of 10 A and is situated at right angles to a magnetic field having a flux density of 0.8 T ; the force on the conductor will be____________?

   A. 240 N
   B. 24 N
   C. 2.4 N
   D. 0.24 N

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

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

7. How does the magnetic compass needle behave in a magnetic field ?

   A. It assures a position right angle to magnetic field
   B. It starts rotating
   C. It assures a position which follows a line of magnetic flux
   D. None of the above

8. A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be______________?

   A. M
   B. M/2
   C. 2 M
   D. M/4

9. If a copper disc is rotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity?

   A. less than that of disc but in opposite direction
   B. equal to that of disc and in the same direction
   C. equal to that of disc and in the opposite direction
   D. less than that of disc and in the same direction

10. For which of the following materials the net magnetic moment should be zero ?

    A. Diamagnetic materials
    B. Ferrimagnetic materials
    C. Antiferromagnetic materials
    D. Antiferrimagnetic materials