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Q.

A sphere weights 10 N and rest in V shaped trough whose sides form an angle 300. Normal reaction excerted by wall B on sphere is (All surfaces of contact are frictionless).

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a

5 N

b

10 N

c

Zero

d

5√3 N

answer is D.

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Detailed Solution

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Horizontal component of N2 will make the sphere move horizontally.But as stated in the problem , the sphere is at rest , So N2 =0

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A sphere weights 10 N and rest in V shaped trough whose sides form an angle 300. Normal reaction excerted by wall B on sphere is (All surfaces of contact are frictionless).