Electronics - Magnetism and Electromagnetism

Exercise : Magnetism and Electromagnetism - General Questions
16.
Which electromagnetic device has a movable iron core called a plunger?
A speaker
A dc generator
A relay
A solenoid
Answer: Option
Explanation:
No answer description is available. Let's discuss.

17.
Which electromagnetic device contains an armature?
A speaker
A dc generator
A relay
A solenoid
Answer: Option
Explanation:
No answer description is available. Let's discuss.

18.
The polarity of induced voltage while a field is collapsing is
independent of the force creating the field
opposite to the force creating the field
identical to the force creating the field
present only if the force is stationary
Answer: Option
Explanation:
No answer description is available. Let's discuss.