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
i think the answer is d. but im not sure!
here we know that ball will drop down by total distance 3.2 m
so here we know that
now using kinematics
now in the same time it will cover horizontal distance of 0.75 m
so speed of the ball will be
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