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A long cylinderivcal coil of inductance ...

A long cylinderivcal coil of inductance `L_(1)` is wound on a bobibs of diameter `d_(1)`. The magnetic induction is the coil connected to a current source is `B_(1)`. After rewinding the coil aaa babbin of diameter`d_(2)` its inductance become `L_(2)`. Find the magnetic induction `B_(2)` of the field in the new coil connected to the same current source assuming that the length of wire is much larger than that of coil.

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