Question

define..what is a solenoid(relevant defiantion)

Answer 1

It is defined as : a coil of wire usually in cylindricalform that when carrying a current actslike a magnet so that a movable core is drawn into the coil when a currentflows and that is used especially as a switch or control for a mechanicaldevice (as a valve) .
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Answer 2

A solenoid is a coil of many turns of wire, wrapped in the shape of cylinder....
hope it is relevant definition for u.....