TOP Magnetism and Electromagnetism Multiple choice Questions and Answers pdf

11. The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is
(a) proportional to 7
(b) proportional to X
(c) proportional to distance between the conductors
(d) inversely proportional to I
Ans: b

12. A material which is slightly repelled by a magnetic field is known as
(a)     ferromagnetic material
(b)     diamagnetic material
(c) paramag>etic material
(d) conducting material
Ans: b

13. 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
Ans: b

14. 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 car¬rying conductor in a magnetic field
(d) polarity of a magnetic pole
Ans: c

15. The ratio of intensity of magnetisation to the magnetisation force is known as
(a) flux density
(b) susceptibility
(c) relative permeability
(d) none of the above
 Ans: b

16. Magnetising steel is normals difficult because
(a)     it corrodes easily
(6)     it has high permeability
(c) it has high specific gravity
(d) it has low permeability
Ans: d

17. The left hand rule correlates to
(a) current, induced e.m.f. and direc¬tion 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 direc¬tion of force on a conductor
Ans: d

18. The unit of relative permeability is
(a)     henry/metre  
(b)     henry
(c) henry/sq. m
(d) it is dimensionless
Ans: d

19. A conductor of length L has current I passing through it, when it is placed parallel to a magnetic field. The force experienced by the conductor will be
(a) zero
(b) BLI
(c) B2LI
(d) BLI2
Ans: a

20. The force between two long parallel conductors is inversely proportional to
(a)     radius of conductors
(b)     current in one conductor
(c) product of current in two conduc¬tors
(d) distance between the conductors
Ans: d

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