Question

What is selonoid???????

Answer 1

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coil with many circular close turns of insulated copper wire (like a cylinder as shown above) is a solenoid. One end of such a solenoid behaves like the north pole and the other as a south pole. Therefore magnetic field due to current in the solenoid is similar to a bar magnet.

Answer 2

Answer:

a cylindrical coil of wire acting as a magnet when carrying electric current.