Eddy Currents, Self and Mutual Inductance NEET Questions

Physics - Electromagnetic Induction and Alternating Currents

Eddy Currents, Self and Mutual Inductance MCQ Questions


7.
Which of the following is true for self-inductance?
A.
It is inversely proportional to the area
B.
It increases with increasing turns
C.
It is a form of inertia in circuits
D.
It has no practical applications
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ANSWER :
C. It is a form of inertia in circuits
8.
The SI unit of self-inductance and mutual inductance is:
A.
Henry
B.
Weber
C.
Tesla
D.
Joule
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ANSWER :
A. Henry
9.
A coil of N turns has inductance L. What will be its inductance if the number of turns is doubled?
A.
L/2
B.
L
C.
4L
D.
L/4
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ANSWER :
C. 4L
10.
The direction of eddy currents is determined by:
A.
Lenz’s Law
B.
Faraday’s Law
C.
Newton’s Law
D.
Ohm’s Law
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ANSWER :
A. Lenz’s Law
11.
In an ideal transformer, eddy current losses are:
A.
Zero
B.
Very high
C.
Negligible
D.
Finite but reduced
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ANSWER :
C. Negligible
12.
Eddy currents are stronger in:
A.
Thin wires
B.
Thick plates
C.
Magnetic materials
D.
Insulators
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ANSWER :
B. Thick plates