Eddy Currents, Self and Mutual Inductance NEET Questions

Physics - Electromagnetic Induction and Alternating Currents

Eddy Currents, Self and Mutual Inductance MCQ Questions


1.
Eddy currents are induced in:
A.
Bulk pieces of conductors
B.
Thin insulated wires
C.
Only in ferromagnetic materials
D.
Only in magnetic materials
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ANSWER :
A. Bulk pieces of conductors
2.
Eddy currents were first discovered by:
A.
James Clerk Maxwell
B.
Heinrich Lenz
C.
Michael Faraday
D.
Foucault
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ANSWER :
D. Foucault
3.
Eddy currents follow which of the following laws?
A.
Ohm's law only
B.
Both Faraday's and Lenz's laws
C.
Coulomb's law only
D.
Only Ampere's law
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ANSWER :
B. Both Faraday's and Lenz's laws
4.
A common undesirable effect of eddy currents is:
A.
Production of magnetic field
B.
Reduction of resistance
C.
Generation of useful voltage
D.
Heating and energy loss in transformer cores
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ANSWER :
D. Heating and energy loss in transformer cores
5.
To minimize eddy current losses in a transformer core, the core is:
A.
Kept at high temperature
B.
Made of laminated thin sheets of iron insulated from each other
C.
Made of thick solid iron
D.
Made of copper
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ANSWER :
B. Made of laminated thin sheets of iron insulated from each other
6.
Which of the following is NOT a useful application of eddy currents?
A.
Electromagnetic braking in trains
B.
Induction furnace
C.
Dead-beat galvanometer
D.
Core of an ideal transformer
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ANSWER :
D. Core of an ideal transformer