1) 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
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2) Magnetising steel is normals difficult because____________? a. it corrodes easily b. it has high permeability c. it has high specific gravity d. it has low permeability
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3) 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
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4) 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
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5) Materials subjected to rapid reversal of magnetism should have______________? a. large area oiB-H loop b. high permeability and low hysteresis loss c. high co-ercivity and high retentivity d. high co-ercivity and low density
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6) The unit of relative permeability is_____________? a. henry/metre b. henry c. henry/sq. m d. it is dimensionless
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7) Indicate which of the following material does not retain magnetism permanently a. Soft iron b. Stainless steel c. Hardened steel d. None of the above
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8) 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 conductors d. distance between the conductors
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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
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10) 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
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