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With two forces acting at a point, the maximum effect is obtained when their resultant is $4 \mathrm{~N}$. If they act at right angles, then their resultant is $3 \mathrm{~N}$. Then the forces are
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$\left(2+\frac{1}{2} \sqrt{2}\right) \mathrm{N}$ and $\left(2-\frac{1}{2} \sqrt{2}\right) \mathrm{N}$
$\left(2+\frac{1}{2} \sqrt{2}\right) \mathrm{N}$ and $\left(2-\frac{1}{2} \sqrt{2}\right) \mathrm{N}$
$P+Q=4, P^2+Q^2=9 \Rightarrow P=\left(2+\frac{1}{2} \sqrt{2}\right) N$ and $Q=\left(2-\frac{1}{2} \sqrt{2}\right) N$
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