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.Management Sciences
Category: Electromagnetic Induction
In case all the flux from the current in coil 1 links with coil 2, the co-efficient of coupling will be____________?
0
A. 2.0
B. 1.0
C. 0.5
D. zero
Air-core coils are practically free from______________?
A. hysteresis losses
B. eddy current losses
C. both (A) and (B)
D. none of the above
The emf induced in a conductor of unit length moving with unit velocity at right angles to a magnetic field is equal to_____________?
A. Magnetic flux density
B. Torque
C. Mutual induction
D. Motional emf
A metal rod of 25 cm length is moving at a speed of 0.5/sec in direction perpendicular to 0.25T magnetic field. Emf produced in the rod is_____________?
A. 0 volt
B. 3.125 volt
C. 31.25 volt
D. 0.03125 volt
Mutually inductance between two magnetically-coupled coils depends on____________?
A. permeability of the core
B. the number of their turns
C. cross-sectional area of their common core
D. all of the above
An electric current induced within the body of a conductor when that conductor either moves through a non uniform magnetic field or in a region where there is a change in magnetic flux is called_____________?
A. Induced current
B. Eddy current
C. Back emf
D. None of the above
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