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a) What would have to be the self-inductance of a solenoid for it to store 10.2...

a) What would have to be the self-inductance of a solenoid for it to store 10.2 J of energy when a 1.40 A current runs through it? L= 10.4 H

b) If this solenoid's cross-sectional diameter is 4.00 cm , and if you could wrap its coils to a density of 10 coils/mm , how long would the solenoid be? I need help with part B please!

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