What is the maximum value of the force F such that the block shown in the arrangement, does not move ? (Take g=10m/s2)
A
20N
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B
10N
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C
12N
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D
15N
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Solution
The correct option is A20N Here by free body diagram of the block with resolved forces, For body to be in equilibrium by balancing forces, we get N=(Mg+Fsin60∘) Fcos60∘=f
For limiting case f=μN f=Fcos60∘=μN=μ(Mg+Fsin60∘)⇒F=μMgcos60∘−μsin60∘=12√3×√3×1012−12√3×√32