Question

you have a soft iron on which a wire of 25 turns is wound.you replace the wire by a longer one of 50 turns. compare the strengths of both electromagnet

Answer 1

the case is of solenoid -
more will be the number of turns more will be the dense will be the current current and we know that-

B is Directly proportional to I
so, more will be the current, more will be its magnetic field

Ans- the iron with 50 turns has more magnetic field

I hope it will work you out