Question

A coil of one turn is made of a wire of certain length and then from the same length a coil of two turns is made. If the same current is passed in both the cases, then the ratio of the magnetic inductions at their centres will be(a) 2 : 1(b) 1 : 4(c) 4 : 1(d) 1 : 2

Answer 1

its 1:2 bcoz magnetic induction directly depend upon number of turns