Concepts Of Physics MCQ Edition [Volume 1]PhysicsSome Mechanical Properties of Matter

Before breaking, a wire is able to sustain a weight of 20 kg . If the wire is cut into two equal parts, each part can sustain a weight of

Options

A10 kg
B20 kg
C40 kg
D80 kg

Correct answer

B. 20 kg

Step-by-step solution

The breaking force of a wire is given by F = Breaking stress A , where A is the area of cross-section. Breaking stress is a property of the material and is independent of the length of the wire. When the wire is cut into two equal parts, the area of cross-section A remains unchanged. Therefore, the breaking force remains the same, and each part can sustain the same weight of 20 kg .

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