Q1: What type of device consists of a coil with a moveable iron core?

A relay

B armature

C reed switch

D solenoid

ANS:A - solenoid

A solenoid is a type of electromagnet when the purpose is to generate a controlled magnetic field. If the purpose of the solenoid is instead to impede changes in the electric current a solenoid can be more specifically classified as an inductor rather than an electromagnet.

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