A wire is suspended from the ceiling and stretched under the action of a weight F suspended from its other end. The force exerted by the ceiling on it is equal and opposite to the weight.

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Tensile stress at any cross section A of the wire

Tensile stress at any cross section is zero

Tensile stress at any cross section of the wire

Tension at any cross section A of the wire is 2F

answer is A.

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Detailed Solution

When a wire is suspended from the ceiling and stretched under the action of a weight (F) suspended from its other end, the force exerted by the ceiling on it is equal and opposite to the weight. However, the tension at any cross-section A of the wire is just F and not 2F. Hence, tensile stress which is equal to the tension per unit area is equal to F/A.

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