Self-Inductance

Level pending

An air cored solenoid of self inductance L has N turns of fine insulated copper wire with cross sectional area A . If the cross sectional area and the number of turns are doubled and the core is a medium of permeability 1000μo , what will be the new self inductance of the coil?

0.008L 0.004L 4000L 8000L

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