In the circuit shown, Vs is a 10 V square wave of period, T = 4 ms with R = 500 Ω and C = 10 μF. The capacitor is initially uncharged at t = 0, and the diode is assumed to be ideal. The voltage across the capacitor (Vc) at 3 ms is equal to ____ volts (rounded off to one decimal place).
Enter numerical value using the virtual keypad. Round off where necessary.