Physics - EMI/AC Question with Solution | TestHub

$\text{A}={\text{A}}_0{\text{ e}}^{-\frac{\text{bt}}{2\text{m}}}$

After 5 second

$\text{0.9}{\text{A}}_0={\text{A}}_0{\text{ e}}^{-\frac{\text{b}\left(5\right)}{2\text{m}}}$...... (i)

After 10 more second

$\text{A}={\text{A}}_0{\text{ e}}^{-\frac{\text{b}\left(15\right)}{2\text{m}}}$...... (ii)

From (i) and (ii)

$\text{A}={\text{0.729 A}}_0$