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  • A coil is wound of a frame of rectangular cross-section. If the linear dimensions of the frame are doubled and the number of turns per unit length of the coil remains the same, then the self induct

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

Option: 1

6


Option: 2

12


Option: 3

8


Option: 4

16


Answers (1)

best_answer

The number of turns has become twice and area has gone up four times. Therefore self inductance is 4x2 = 8 times.\mathrm{X_L=\omega L=2 \pi v L} with iron core \mathrm{X}_L increases. Since \mathrm{1=\frac{E}{X_L}, }  

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Suraj Bhandari

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