Magnetism & Electromagnetism Mcqs - Set 2

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
Answer  Explanation 

ANSWER: direction of force on a current carrying conductor in a magnetic field

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: it has low permeability

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: the magnetic lines of force will bend away from their usual paths in order to pass through the piece

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: susceptibility

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: high permeability and low hysteresis loss

Explanation:
No explanation is available for this question!


6)   The unit of relative permeability is_____________?

a. henry/metre
b. henry
c. henry/sq. m
d. it is dimensionless
Answer  Explanation 

ANSWER: it is dimensionless

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: Soft iron

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: distance between the conductors

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: current, magnetic field and direction of force on a conductor

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: zero

Explanation:
No explanation is available for this question!