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In the circuit shown here, what is the v...

In the circuit shown here, what is the value of the unknown resistor R, so that the total resistance of the circuit between points P and Q is also equal to R? ltBrgt

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
D
As no external force acts on the two blocks friction acts like an internal force and thw two blocks will move with common velocity.
By applying conservatin of momentum
`(1 kg) (15 m//s) = 1v = 2v rArr v = 5 m//s`
`P_(1) = 5 N-s , P_(2) = 10N-s`
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