First slide

Inductance

Question

A magnetic flux of 5 x10^-4 Wb is associated with every 10 turns of a 500 turns coil. The electric current flowing through the wire is 5 A. What is the self-inductance of the coil?

Moderate

A

$0.5 H$
B

$5 \times 10^{- 3} H$
C

$5.0 H$
D

$5 \times 10^{- 2} H$

Solution

Total magnetic flux linked with coil
$\begin{array}{l} ϕ = \frac{5 \times 10^{- 4}}{10} \times 500 = 2.5 \times 10^{- 2} Wb \\ L = \frac{ϕ}{i} = \frac{2.5 \times 10^{- 2}}{5} = 5 \times 10^{- 3} H \end{array}$

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