What is the maximum value of the force \( F \) such that the block shown in the arrangement, doe...

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What is the maximum value of the force \( F \) such that the block shown in the arrangement, does not move
[IIT-JEE (Screening) 2003]
(a) \( 20 \mathrm{~N} \)
(b) \( 10 \mathrm{~N} \)
(c) \( 12 \mathrm{~N} \)
(d) \( 15 \mathrm{~N} \)
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