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A right triangular plate ABC of mass m i...

A right triangular plate ABC of mass m is free to rotate in the verticle plane about a fixed horizontal axis through A. It is supported by a string such that the side AB is horizontal. The reaction at the support A is

A

`mg/3`

B

`2mg/3`

C

`mg/2`

D

mg

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The correct Answer is:
B
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