what is solenoid coil? explain
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=>The solenoid is a long cylindrical coil of wire consisting of a large number of turns bound together very tightly.
The length of the coil should be longer than its diameter.
Magnetic field around a current carrying solenoid is shown in figure. These appear to be similar to that of a bar magnet.
When soft iron rod is placed inside the solenoid, it behaves like an electromagnet. The use of soft iron as core in the solenoid produces the strong magnetism.
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