Two blocks ( \( m \) and \( M \) ) are arranged as in figure. There is friction between ground a...

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Two blocks ( \( m \) and \( M \) ) are arranged as in figure. There is friction between ground and \( M \) only and other surfaces are frictionless. The coefficient of DU friction between ground and \( M \) is \( \mu=0.25 \). The maximum ratio of \( m \) and \( M(m / M) \) so that the system remains is at rest
(1) \( \frac{1}{3} \)
(2) \( \frac{1}{4} \)
(3) 3
(4) none of these
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