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If each resistance in the figure is of 9...

If each resistance in the figure is of `9Omega` then reading of ammeter is

A

1

B

3

C

5

D

4

Text Solution

Verified by Experts

The correct Answer is:
B
By appplying conservation of momentum
`mv_(1) + Mv_(2) = 0 rArr v_(1) = -4v_(2)` …..(i)
By applying conservation of energy
`(1)/(2)mv_(1)^(2) + (1)/(2)Mv_(2)^(2) = mgh rArr (v_(1)^(2))/(2) + 2v_(2)^(2) = 20` ……(ii)
`v_(2) = sqrt2m//s , v_(1) = 4 sqrt2 m//s`.
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ALLEN -CURRENT ELECTRICITY-EXERCISE-III
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