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

Concepts Of Physics MCQ Edition [Volume 1]

Exam: Concepts Of Physics MCQ Edition [Volume 1]
Subject: Physics
Chapter: Some Mechanical Properties of Matter

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

Before breaking, a wire is able to sustain a weight of 20 kg . If...

Before breaking, a wire is able to sustain a weight of

20 \text{ kg}

. If the wire is cut into two equal parts, each part can sustain a weight of

Options

A $10 \text{ kg}$
B $20 \text{ kg}$
C $40 \text{ kg}$
D $80 \text{ kg}$

Correct answer

B. $20 \text{ kg}$

Step-by-step solution

The breaking force of a wire is given by

F = \text{Breaking stress} \times 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 \text{ kg}

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