Question: Two tightly wound solenoids have the same length and circular cross-sectional area. But solenoid 1uses wire that is half as thick as solenoid 2. (a)

Two tightly wound solenoids have the same length and circular cross-sectional area. But solenoid 1uses wire that is half as thick as solenoid 2.
(a) What is the ratio of their inductances?
(b)What is the ratio of their inductive time constants (assuming no other resistance in the circuits)?

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