Electromagnetics Field (3140912) MCQs

MCQs of Magnetic forces, materials and inductance

Showing 11 to 20 out of 171 Questions
1 2 3 4 5 6
11.
The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is
(a) ∝ I
(b) ∝ I2
(c) ∝ distance between the conductors
(d) Both (b) and (c)
Answer:

Option (b)

12.
A material which is slightly repelled by a magnetic field is known as
(a) Ferromagnetic material
(b) Diamagnetic material
(c) Paramagnetic material
(d) Conducting material
Answer:

Option (b)

13.
When an iron piece is placed in a magnetic field
(a) Magnetic lines of force will bend away from their usual paths in order to go away from the piece
(b) Magnetic lines of force will bend away from their usual paths in order to pass through the piece
(c) Magnetic field will not be affected
(d) Iron piece will break
Answer:

Option (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 carrying conductor in a magnetic field
(d) Polarity of a magnetic pole
Answer:

Option (c)

15.
The ratio of intensity of magnetization to the magnetization force is known as
(a) Flux density
(b) Susceptibility
(c) Relative permeability
(d) None of above
Answer:

Option (b)

16.
Magnetizing a steel is normally difficult because
(a) It corrodes easily
(b) It has high permeability
(c) It has high specific gravity
(d) It has low permeability
Answer:

Option (d)

17.
Fleming's left hand rule correlates to
(a) Current, induced emf 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:

Option (d)

18.
The unit of relative permeability is
(a) Henry/meter
(b) Henry
(c) Henry/meter2
(d) Dimensionless
Answer:

Option (d)

19.
A conductor of length L has current I passing through it, when it is placed parallel to a magnetic field of density B. The force experienced by the conductor will be
(a) Zero
(b) BIL
(c) B2 IL
(d) BI2 L
Answer:

Option (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 conductors
(d) Distance between the conductors
Answer:

Option (d)

Showing 11 to 20 out of 171 Questions
1 2 3 4 5 6