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21.A solenoid having a core of cross section 4 cm square half air and half iron (relative permeability is equal to 500) is 22 cm long if the number of turns on it is 10 power 3 its self inductance is

Answer» 21.A solenoid having a core of cross section 4 cm square half air and half iron (relative permeability is equal to 500) is 22 cm long if the number of turns on it is 10 power 3 its self inductance is


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