Eels are able to generate current with biological cells called electroplaques. The electroplaques in an eel are arranged in 100 rows, each row stretching horizontally along the body of the fish containing 5000 electroplaques. The arrangment is suggestively shown below. Each electroplaques has an emf of `0.15 V` and internal resistance of `0.25 Omega`
The water surrounding theeel completes a cricuit be ween the head and its tail. If the water surrounding it has a resistance of `500 Omega`, the current an eel can produce in water is about

Answer

(i) `0.66` (ii) `4 m`

Explanation

For first collision with plate A, final velocity of ball `v_(1) = ev_(0) = e sqrt(2gh_(0))` ….(i)
For second collision `mv = 4mv' rArr v' = (v)/(4)`
`rArr e sqrt((2gh_(0))/(4)) = sqrt(2gh_(2)) rArr e = (2)/(3)`
Height attained after first collision
`:. h_(1) = e^(2)h_(0) = (2)/(3) xx (2)/(3) xx 9 = 4m`