﻿ Find the ratio of breaking force required to break the wire of radius r to that of 2r. from Physics Mechanical Properties of Solids Class 11 Manipur Board

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Mechanical Properties of Solids

Physics Part II

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Find the ratio of breaking force required to break the wire of radius r to that of 2r.

Radius of the wire is given by r and 2r.
The breaking force of wire is given by,

F = σA

where,
σ is the breaking stress (constant of material) and A is the area of cross section.

Let F1 and F2 be the breaking force for wires respectively.

Therefore,

Hence the breaking force required to break the thick wire is four times the thin wire.

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Cohesive attraction or cohesive force is the force of attraction between same types of molecules sticking together.
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