Can someone help me with the last part please

What is the most useful equation for electric power?

An air-filled capacitor is formed from two long conducting cylindrical shells that are coaxial and have radii of 26 mm and 103 mm. the electric potential of the inner conductor with respect to the outer conductor is - 700 v (k = 1/4πε 0 = 8.99 × 109 n · m2/c2) the energy stored in a 1.0-m length of this capacitor is closest to

In a star, nuclear fusion occurs in the a. photosphere. b. corona. c. radiative zone. d. core.