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In the arrangement shown in figure, pulley and string are light. Friction coefficient between the two blocks is `mu` whereas the incline is smooth. Block A has mass m and difference in mass of the two blocks is`deltam`. Find minimum value of m for which the system will not accelerate when released from rest.

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The correct Answer is:
`mu_("min") = (deltam)/(2m) "tan"theta`
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