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Two cells , each of emf E and internal r...

Two cells , each of `emf E` and internal resistance `r`, are connected in parallel across a resistor `R`. The power delivered to the resistor is maximum if `R` is equal to

A

4

B

5

C

6

D

Ball will not collide with the flag

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The correct Answer is:
C
As horizontal velocity (i.e velocity along the surface) remains constant so required time `= (30)/(5) = 6s`
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ALLEN -CURRENT ELECTRICITY-EXERCISE-III
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