Final answer:
The total capacitance of a 20 µF and a 30 µF capacitor connected in parallel is 50 µF, which corresponds to option b.
Step-by-step explanation:
When two capacitors are connected in parallel, the total capacitance is simply the sum of the individual capacitances. In this case, we have a 20 µF capacitor and a 30 µF capacitor connected in parallel. To find the total capacitance (Ctotal), you add the two values:
Ctotal = C1 + C2
Ctotal = 20 µF + 30 µF
Ctotal = 50 µF
Therefore, the correct answer is 50 µF, which corresponds to option b. This is the total capacitance when the two capacitors are connected in parallel.