MHT CET Physics question

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

• (A)increases by a factor of 3
• (B)decreases by a factor of
• (C)increases by a factor of 27Correct
• (D)decreases by a factor of 9