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The self-inductance of an air core solen...

The self-inductance of an air core solenoid of 100 turns is 1 mH. The self-inductance of another solenoid of 50 turns (with the same length and cross-sectional area) with a core having relative permeability 500 is

A

a. 125 mH

B

b. 24 mH

C

c. 60 mH

D

d. 30 mH

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