Question

An air core solenoid has 1000 turns and is one metre long. Its cross-sectional area is $10c{m}^2$ . Its self inductance is

• A. $0.1256mH$
• B. $12.56mH$
• C. $1.256mH$
• D. $125.6mH$

Answer 1

Answer: (C)

$1.256mH$

Given:

$n=1000A=10c{m}^2$

$L=\frac{{\mu }_0{N}^{2}A}{l}=\frac{4\pi \times {10}^{-7}\times (1000{)}^2\times 10\times {10}^{-4}}{1}$

$=1.256mH$