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Correct option is A)

For $Q_{1}$

$v1 −u1 =f1 $

Now, $v=−v$ and $u=−20$

Putting back the values,

$v−1 +201 =f1 $

Similarly, for $O_{2}$,

$v1 +401 =f1 $

Solving the 2 eqns simultaneously for f, we get f = $380 $

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