Eddy Currents, Self and Mutual Inductance NEET Questions

Physics - Electromagnetic Induction and Alternating Currents

Eddy Currents, Self and Mutual Inductance MCQ Questions


7.
In electromagnetic damping of galvanometers, eddy currents:
A.
Make the coil oscillate indefinitely
B.
Increase oscillation time
C.
Have no effect on the motion
D.
Bring the coil quickly to rest
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ANSWER :
D. Bring the coil quickly to rest
8.
The principle behind an induction furnace is:
A.
Resistive heating
B.
Convection heating
C.
Radiation heating
D.
Eddy current heating in metals
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ANSWER :
D. Eddy current heating in metals
9.
Eddy currents in a moving metal plate in a magnetic field:
A.
Have no effect
B.
Accelerate the plate
C.
Produce a retarding force
D.
Rotate the plate
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ANSWER :
C. Produce a retarding force
10.
In an induction cooker, the cookware gets heated because of:
A.
Eddy currents induced in the cookware by alternating magnetic field
B.
Direct flame contact
C.
Microwave absorption
D.
Conduction from the cooker surface
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ANSWER :
A. Eddy currents induced in the cookware by alternating magnetic field
11.
A metallic pendulum bob swings between pole pieces of a strong magnet. Compared to a non-metallic bob:
A.
Metallic bob is quickly damped
B.
Metallic bob oscillates indefinitely
C.
Metallic bob swings faster
D.
No difference
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ANSWER :
A. Metallic bob is quickly damped
12.
Eddy currents can be reduced by:
A.
Reducing the cross-section of wires
B.
Increasing the applied voltage
C.
Using laminated cores with insulation between layers
D.
Using solid iron cores
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ANSWER :
C. Using laminated cores with insulation between layers