A 30 μF capacitor has an initial charge of 25 μC. It is discharged through an 6000 Ω resistor. Find:

a) the current at 16 ms;

0.127mA

b) the charge at 16 ms;

23 μC

c) the power loss in the resistor at 16 ms.

0.0968mW

d) How long does it take for the energy in the capacitor to drop to 10% of its initial value?

????ms.

It is only question d) which causes me trouble