# Started learning EM!

A solenoid of length $$20 \text{ cm}$$, area of cross section $$4 \text{ cm}^{2}$$ and having 4000 turns is placed inside another solenoid of 2000 turns having cross sectional area $$8 \text{ cm}^{2}$$ and length $$10 \text{ cm}$$. Find the mutual inductance between both the solenoids in henries.

×