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Q.

What is the self inductance of solenoid of length 31.4cm, area of cross section 10^-3m² and total number of turns 10³?

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a

4H

b

4 mH

c

40H

d

0.4 H

answer is A.

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Detailed Solution

$L = \frac{μ_{0} N^{2} A}{L}$

$= \frac{4 π \times 10^{- 7} \times {(10^{3})}^{2} \times 10^{- 3}}{31.4 \times 10^{- 2}} = 4 m A$

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