Maximum Force for Blocks Together

Two blocks (m=0.5kg and M=4.5kg) are arranged on a horizontal frictionless table as shown in figure. The coefficient of static friction between the two blocks is ‌

. Then, the maximum horizontal force that can be applied on the larger block so that the blocks move together is ...... N.
(Round off to the nearest integer. Take, g=9.8ms−2 )

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