A solenoid of length 30 cm with 10 turns per centimetre and area of cross-section 40 cm 2 completely surrounds another co-axial solenoid of same length, area of cross-section 20 cm 2 with 40 turns per centimetre. The mutual inductance of the system is
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Mutual induction of the system 
where 
is the area of inner solenoid.
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