The most important advantage of AC (alternating current) over DC (direct current) is that

a. it is relatively straightforward to change the voltage delivered by an AC source.
b. AC is safer.
c. DC could only be used in the early days of electrical power distribution.
d. electric power cannot be delivered by a DC source.
e. DC results in more power loss in wire than AC.

compass can be used day and night, cloudy or sunny

there are no components of a physical goal mentioned on the list of choices that you've provided.

energy stored in the capacitor= 9.72 x 10⁻⁴ j

explanation:

the energy stored in the capacitor is given by

e= 1/2 c v²

e= energy stored

c= capacitance= 1.5 µc= 1.5 x 10⁻⁶f

v= potential difference=36 v

so energy stored= e= 1/2 (1.5 x 10⁻⁶) (36)²

energy stored= 9.72 x 10⁻⁴j