Find the time in which the current changes from 3 A to 1 A through an inductor of 10 H. The emf induced in the inductor is 20 V. Also, find the magnetic flux linked with the inductor.

Explanation

To solve the problem step by step, we need to find the time it takes for the current through an inductor to change from 3 A to 1 A, given that the induced emf is 20 V and the inductance is 10 H. We will also find the magnetic flux linked with the inductor.

### Step 1: Determine the change in current (ΔI)
The initial current (I1) is 3 A and the final current (I2) is 1 A. The change in current (ΔI) can be calculated as:
\[ \Delta I = I2 - I1 = 1 \, \text{A} - 3 \, \text{A} = -2 \, \text{A} \]

...