When will capacitor fully charged?
a) When the voltage across its plates is half the voltage from ground to one of its plates
b) When the current through the capacitor is a 1/root2 time its value
c) When the supply voltage is equal to the capacitor voltage
d) Never

Answer

A, B, C, D

Explanation

For every ball
`u=0, a=g=9.8 m/s^2 `4th ball moves for 2 sec. 5th ball for 1 sec and 3rd ball for 3 sec when 6th ball is being dropped. For 3rd ball
`t=3 sec
:. S_1 = ut+ 1/2 atI^2ltbrge0+1/2 9.8(3)^2
=44.1 m` below the top. For 4th ball
t=2 sec
` :. S_2 = 0+1/2 g^2=1/2xx9.8 xx(2)^2
=19.6`m below the top [u=0]
for 5th ball t=1 sec
`:. S_3 = ut+ 1/2 at^2
=0+ 1/2 xx 9.8x t^2
=4.9` m below the top.