Eddy Currents, Self and Mutual Inductance NEET Questions

Physics - Electromagnetic Induction and Alternating Currents

Eddy Currents, Self and Mutual Inductance MCQ Questions


13.
Eddy currents produce:
A.
Heat and magnetic force
B.
Only heat
C.
Electric field only
D.
Only magnetic force
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ANSWER :
A. Heat and magnetic force
14.
In a magnetic brake:
A.
The magnet physically grips the disc
B.
Eddy currents in the metal disc produce a braking force
C.
Air resistance slows the motion
D.
Friction stops the vehicle
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ANSWER :
B. Eddy currents in the metal disc produce a braking force
15.
The direction of eddy currents is such that:
A.
They accelerate the change causing them
B.
They are always clockwise
C.
They flow radially outward
D.
They oppose the change causing them
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ANSWER :
D. They oppose the change causing them
16.
Eddy current loss in transformer cores depends on:
A.
Frequency of the AC supply
B.
All of the above
C.
Thickness of the laminations
D.
Maximum flux density
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ANSWER :
B. All of the above
17.
In a train's electromagnetic braking system, what happens to the kinetic energy of the train?
A.
It is converted to electrical energy then dissipated as heat
B.
It is converted directly to sound
C.
It is stored in the magnet
D.
It is reflected back
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ANSWER :
A. It is converted to electrical energy then dissipated as heat
18.
An aluminum disc rotates in a magnetic field. The reason for its gradual slowing down even without friction is:
A.
Eddy currents producing retarding force
B.
Air resistance
C.
Decrease in magnetic field
D.
Gravitational pull
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ANSWER :
A. Eddy currents producing retarding force