In the left hand rule, forefinger always represents______________?

Related Mcqs:

1. 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

2. Fleming’s left hand rule is used to find_________________?

   A. direction of magnetic field due to current carrying conductor
   B. direction of flux in a solenoid
   C. direction of force on a current carrying conductor in a magnetic field
   D. polarity of a magnetic pole

3. The bar magnet has____________?

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

4. A certain amount of current flows through a ring-shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil ?

   A. Decreases
   B. Increases
   C. Remains same
   D. First increases and then decreases depending on the depth of iron in¬sertion

5. The relative permeability of materials is not constant

   A. diamagnetic
   B. paramagnetic
   C. ferromagnetic
   D. insulating

6. 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

7. One maxwell is equal to____________?

   A. 10 webers
   B. 10 webers
   C. 10 webers
   D. 10 webers

8. Which of the following is a ferromagnetic material ?

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

9. 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

10. Ferrites are materials

    A. paramagnetic
    B. diamagnetic
    C. ferromagnetic
    D. none of the above