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Q.

Mass m is released from point A as shown in figure then tension in the string at the point B will be

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a

3mg

b

mg

c

2mg

d

4mg

answer is C.

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Detailed Solution

$T = \frac{{mv}^{2}}{r} + mg$
$v = \sqrt{2 gl}$

$Thus, T = 3 mg$

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