In the given arrangement the maximum value of $F$ for which there is no relative motion between the blocks
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(c)

$\left(m_1+m_2\right) a_{\text {max }}=f$

$\rightarrow F=\mu N$

$N=m_1 g$

$m_2 a_{\text {max }}=\mu m_1 g$

$a_{\text {max }}=\mu \frac{m_1}{m_2} g$

$F=\left(m_1+m_2\right) \mu \frac{m_1}{m_2} g$

$= m_2\left(\frac{m_1}{m_2}+1\right) \mu \frac{m_1}{m_2} g$

$F =\mu m_1\left(\frac{m_1}{m_2}+1\right)$

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