Physics-
General
Easy
Question
Two coaxial solenoids are made by winding thin insulated wire over a pipe of cross-sectional area 
and length=20 cm. If one of the solenoids has 300 turns and the other 400 turns , their mutual inductance is 
The correct answer is:
Where, 
=300 turns, 
=400 turns, and 
=20cm.
Substituting the values in the given formula, we get
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