Torque wrench

The picture [A] above is a \(20\) cm wrench which can tighten a bolt with at least \(50\) N of force. If the length of the wrench is increased to \(50\) cm as in [B] above, what is minimum force required for it to tighten the same bolt as before? (The forces are acting vertical to the axis of the wrench in both cases.)

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