A current of 3 A flows through the `2 Omega ` resistor shown in the circuit below. The power dissipated in the `5 Omega` resistor is

Options

A. `(mv^(2))/(2 (L - nr))`
B. `(mv^(2))/(L - nr)`
C. zero
D. `(mv^(2))/(L - 2 nr)`

Answer

D

Explanation

Change In momentum in each collision with rigid support `DeltaP = 2mv`
time gap between two successive collision with same support `Deltat = (2L - 4nr)/(v)`
`F_("ave") = (DeltaP)/(Deltat)`