Magnetic flux of $10 μ$ Wb is linked with a coil, when a current of $2$ mA flows through it. What is the seld inductance of the coil?

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Solution

The correct option is B $5$ mH
Magnetic flux linked with the coil is
$ϕ = L i$
$L = \frac{ϕ}{i}$

$= \frac{10 \times 10^{- 6}}{2 \times 10^{- 3}} = 5 \times 10^{- 3} = 5 m H$

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