Copper Young's modulus

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Title:

Measuring Young's modulus of copper

Aim:

To study the stress/strain behavior of copper wire and estimate the Young's modulus of copper

Apparatus:

Copper wire s.w.g.32 about 4 m

G-clamp ?1

Wooden block ?2

Metre rule ?4

Pulley on clamp ?1

Micrometer screw gauge ?1

Hanger (0.01 kg) ?1

Slotted mass (0.05 kg) ?8

Slotted mass (0.1 kg) ?6

Slotted mass (0.2 kg) ?4

Slotted mass (0.5 kg) ?1

White label sticker ?1

Safety goggles ?1

Rubber tile ?1

Theory:

When a force F is applied to the end of a wire with cross-sectional area A along its length, the tensile stress =

If the extension of the wire is ?l, and its original length is lo, the tensile strain =

Under elastic conditions, a modulus of elasticity of a wire, called the Young modulus E, is defined as the ratio of the tensile stress applied to a body to the tensile strain produced. where E is expressed in N m-2 or Pascal (Pa).

E is a constant when ?l