A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectional area of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air ?

Related Mcqs:

1. 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

2. 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

3. The change of cross-sectional area of conductor in magnetic field will affect______________?

   A. reluctance of conductor
   B. resistance of conductor
   C. A. and B. both in the same way
   D. none of the above

4. Magnetism of a magnet can be destroyed by_____________?

   A. heating
   B. hammering
   C. by inductive action of another magnet
   D. by all above methods

5. The bar magnet has____________?

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

6. 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

7. When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon____________?

   A. resistance of the coil
   B. motion of the magnet
   C. number of turns of the coil
   D. pole strength of the magnet

8. 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

9. What is the magnitude and the direction of force per 1.1m length of a pair of conductors of a direct current linecarrying 10 amperes and spaced 100 mm apart ?

   A. 22 x 10″8 N
   B. 22 x 10″7 N
   C. 22 x 10-6 N
   D. 22 x 10″5 N

10. 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