If the number of turns per units length of a coils of solenoid is doubled , the self- inductance of the soleniod will

The self-inductance of a long straight solenoid is L. Each of the length, the diameter and the number of turns of another solenoid is double that of the first. The self-inductance of the second solenoid is

A coil is wound on a frame of rectangular cross - section. If all the linear dimensions of the frame are increased by a factor x and the number of turns per unit length of the coil remains the same, self - inductance of the coil increases by a factor of

A coil is wound on a frame of rectangular cross - section. If all the linear dimensions of the frame are increased by a factor 2 and the number of turns per unit length of the coil remains the same, self - inductance of the coil increases by a factor of

A copper wire is wire is wound on a wooden frame, whose shape is that of an equilateral triangle.If the number of turns of the coil per units length of the frame the same, then the self inductance of the coil:

A copper wire is wire is wound on a wooden frame, whose shape is that of an equilateral triangle.If the number of turns of the coil per units length of the frame the same, then the self inductance of the coil: