Figure 16-1 4) If the diode is silicon, what is the voltage across the resistor in Figure 16-1(a)? A) 0.7V B) 0V C) 20V D) 19.3V 5) What is the voltage across the silicon diode in Figure 161 (b)? A) 0.7V B) 0.3V C) 0.7V D) 1.0V 6) If the polarity of the silicon diode is reversed in Figure 161(c),VR2 is A) 25V B) 0.7V C) 0V D) 49.3V 7) What is the current through R2 in Figure 16-1(c) if the diode is silicon? A) OA B) 0.7mA C) 0.3mA D) 25mA