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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A certain volume of copper is drawn into a wire of radius a and is wrapped in shape of a helix having radius r(>>a). The windings are as close as possible without overlapping. Self inductance of the inductor so obtained is L1. Another wire of radius 2 a is drawn using same volume of copper and wound in the fashion as described above. This time the inductance is L2. Find L1/L2

A certain volume of copper is drawn into a wire of radius a and is wrapped in shape of a helix having radius r(>>a). The windings are as close as possible without overlapping. Self inductance of the inductor so obtained is L1. Another wire of radius 2 a is drawn using same volume of copper and wound in the fashion as described above. This time the inductance is L2. Find L1/L2

In the given circuit what is the current I ( in A ) drawn from battery at time t = 0 .