A capacitor in a timing circuit is initially charged to a potential difference of 12.0 V. When the circuit is activated at time t=0t = 0t=0, the capacitor begins to discharge. The potential difference across it decreases by 15.0% of its current value during each 10.0 ms interval.
What is the potential difference across the capacitor at t=40.0 mst = 40.0\text{ ms}t=40.0 ms?
4.80 V4.80\text{ V}4.80 V
5.74 V5.74\text{ V}5.74 V
6.26 V6.26\text{ V}6.26 V
7.37 V7.37\text{ V}7.37 V
