A 75 uF capacitor is connected to a 250 2 resistor as shown in the figure. Initially the switch is open and the capacitor is fully charged. At time t= 0, the switch closes and the capacitor begins to discharge. How long does it take for the charge on the capacitor to be reduced to 40% of its initial value? + + + + C R O 4.7 ms O 17 ms O 25 ms O 9.6 ms hp HEWLETT-PACKARD\fTwo cylindrical wires, made of the same material are merged together as shown. Current / flows into wire 1. The diameter of wire 2 is twice the diameter of wire 1. If the electron drift velocity in wire 1 is v, what is the electron drift velocity in wire 2? I1 2 OV O 4v O 2V O V/2 O V/4 hp HEWLETT-PACKARDCalculate the potential difference between points a and b (V. - Vb) through the 50 ohm resistor. (Hint: you will need to use Kirchhoff's junction law and Ohm's law). 7A 50 0 3A b 4A 4A O -200 V O +600 V O +200 V -600 V hp