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(D) Consider a wire of negligible mass suspended from a ceiling. $A$ force $F$ is applied at the lower end of the wire.Since the wire is massless,the

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$F$

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(D) Consider a wire of negligible mass suspended from a ceiling. $A$ force $F$ is applied at the lower end of the wire.Since the wire is massless,the net force on any segment of the wire must be zero for it to be in equilibrium.If we take any cross-section of the wire and consider the lower part of the wire below that section,the only forces acting on this part are the tension $T$ acting upwards at the cross-section and the weight $F$ acting downwards at the end.Applying Newton's second law,$T - F = ma$. Since the mass $m$ of the wire is zero,$T - F = 0$,which gives $T = F$.Therefore,the tension at any cross-section of the wire is $F$.

In the case of a wire having negligible mass,suspended from a ceiling and stretched under the action of a weight $F$ suspended from its other end,the tension at any cross-section of the wire is

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