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Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class11  >>  Laws of Motion
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Three equal masses of mass m each are hanging on a string passing over a fixed palley as shown. What is the tension in the string connecting weight B and C

a) zero b) $\large\frac{2mg}{3}$ c) $\large\frac{mg}{3}$ d) mg

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1 Answer

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Let acceleration of system be a
For mass $A=T-mg=ma$-----(1)
For mass $B=T_1+mg-T=ma$-----(2)
For mass $C=T_1-mg=ma$-----(3)
Solving the three equations we get
$T_1=\large\frac{2mg}{3}$
Hence b is the correct answer. 

 

answered Jul 12, 2013 by meena.p
edited Feb 10, 2014 by meena.p
 

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