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JEE Main 11 Jan 2019 Shift 2 Solved Paper

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Question : 29

Total: 90

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 :

Decreases by a factor of 9 √3
Increases by a factor of 3
Decreases by a factor of 9
Increases by a factor of 27

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