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Magnetism and Electromagnetism - Technical MCQs

Q1:

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

ANS:D - A solenoid

A solenoid plunger is the moving part of a solenoid that transfers linear motion from the solenoid to the component that it is designed to operate.

The plunger is typically a ferrous metal bar of square or round cross-section designed to fit into the solenoid coil pocket.