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WAEC Physics 2010 Paper

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Question : 43

Total: 50

The energy, E stored in an inductor of inductance L when current I passes through it is given by the equation

E = $\;\frac{1}{2} L I^2$
E = LI²
E $\;\frac{1}{2} L I$
E = $\;\frac{1}{2} L^2 I$

Solution:

Concept:

Energy stored in an inductor depends on its inductance and the square of the current flowing through it.

Explanation:

The standard formula for energy stored in an inductor is:

E = \frac{1}{2} L I^2

Here,

L

is the inductance and

I

is the current.

This formula matches option A.

Answer:

A.

E = \frac{1}{2} L I^2

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