question_answer

A copper wire is wound on a wooden frame, whose shape is that of an equilateral triangle. If the linear dimension of each side of the frame is increased by a factor of 3, keeping the number of turns of the coil per unit length of the frame the same, then the self inductance of the coil [JEE Main 11-Jan-2019 Evening]

A) increases by a factor of 27

B) decreases by a factor of \[9\sqrt{3}\]

C) increases by a factor of 3

D) decreases by a factor of 9