Question

describe change in magnetic field inside a solenoid carrying steady current l if the number of turns is double but the length remain same​

Answer 1

Answer ⤵️

If you keep everything the same, especially the current: It doubles.

It is very difficult to keep really everything the same because, just adding more turns increases their volume. This may be negligable. The best approximation, you can achieved is by reducing the diameter of the wire. But this increases, the resistance. You will need more voltage. The losses increase (more heat produced).Well, the unit of field strength is either the oersted or the Ampere per metre. They are similar, just scaled differently.

There is also a thing called the Ampere Turn per metre, which is essentially the same thing, because a turn of wire is just a trick to use the same number of amps twice in the same place (or as near to the same place as is physically possible).

So the field due to the current in a winding is simply that due to one turn multiplied by the number of turns. (to a first order approximation, of course)

Hope it helps ♥️♥️