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Question

For the arrangement shown in figure the tension in the string is [Given : tan1(0.8)=39]

A
6 N
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B
6.4 N
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C
0.4 N
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D
zero
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Solution

The correct option is D zero
We know that , angle of repose is the maximum angle for the body to be stable in the inclined plane and the tanθ=μ, where μ is the coefficient of friction of the incline plane
Here it is given that angle of repose is θ=39o and incline plane angle is less than angle of repose, hence frictional force is sufficient to hold the block

f1>mg sinθ friction is static
Hence, T=0

Option D is the correct answer

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