Electronics - Magnetism and Electromagnetism

Exercise :: Magnetism and Electromagnetism - General Questions

16. 

Which electromagnetic device has a movable iron core called a plunger?

A. A speaker
B. A dc generator
C. A relay
D. A solenoid

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

17. 

Which electromagnetic device contains an armature?

A. A speaker
B. A dc generator
C. A relay
D. A solenoid

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

18. 

The polarity of induced voltage while a field is collapsing is

A. independent of the force creating the field
B. opposite to the force creating the field
C. identical to the force creating the field
D. present only if the force is stationary

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

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