In an inductor L, current passed `I_0` and energy stored in it is U. If the current is now reduced to `I_0//2`, what will be the new energy stored in the inductor?

Explanation

To find the new energy stored in an inductor when the current is reduced, we can follow these steps:

### Step 1: Understand the formula for energy stored in an inductor
The energy \( U \) stored in an inductor is given by the formula:
\[ U = \frac{1}{2} L I^2 \]
where \( L \) is the inductance and \( I \) is the current flowing through the inductor.
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