what is solenoid???????????
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A solenoid behaves like a bar magnet when current is passed through it. Like in bar magnet, the field lines emerge from one end and merge into another.
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A coil of wire usually in cylindrical form that when carrying a current acts like a magnet so that a movable core is drawn into the coil when a current flows and that is used especially as a switch or control for a mechanical device (such as a valve)
A solenoid is used to control a valve electrically, for example, the solenoid core is used to apply mechanical force to the valve. These can also used in particular types of door locking systems, which use an electromagnet and offer a very secure closure.
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