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Find the length of a solenoid of radius ...

Find the length of a solenoid of radius 2 cm and 800 turns per metre having self-inductance of 0.115 H.

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As `L=(mu_(0)N^(2)A)/(l)`
`l=(mu_(0)N^(2)A)/(L)=(4pi xx 10^(-7) xx (800)^(2) xx pir^(2))/(0.115)`
`=87 xx 10^(7) xx 10^(-7) xx 10^(-4)=0.0087 m=8.7 xx 10^(-3) m`
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