Two masses, each equal to m, are attached to one another by a massless string passing over a smooth pulley. The tension in the string is

m g

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2 m

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\frac{m g}{2}

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Zero

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Solution

The correct option is A $m g$
Since each mass is in equilibrium, the net force on each mass is zero, considering the free body diagram of anyone of the bodies, it can be seen that
T=mg

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