PhysicsA uniform rod of length l and mass m is suspended by two vertical inextensible string as shown in the fig. The tension in the left string when right string snaps, is 

A uniform rod of length l and mass m is suspended by two vertical inextensible string as shown in the fig. The tension in the left string when right string snaps, is
 

  1. A

    mg/4

  2. B

    3mg/4

  3. C

    mg/2

  4. D

    mg/8

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    Solution:

    mg - T = ma .....(1)
    α=τI=mgl2ml23=3g2l ......(2)

    a=l2α .....(3)

    solving equations (1), (2) and (3) 

    We get T = mg/4

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