In the arrangement shown in figure, coefficient of friction between the two block is \( \mu=\fra...

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In the arrangement shown in figure, coefficient of friction between the two block is \( \mu=\frac{1}{2} \). The force of friction acting between the two blocks is
(a) \( 8 \mathrm{~N} \)
(b) \( 10 \mathrm{~N} \)
(c) \( 6 \mathrm{~N} \)
(d) \( 4 \mathrm{~N} \)
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