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A thermoelectric switch composed of a copper rod 1 0 cm long at 2 0 deg C is to touch an electrical contact at

A thermoelectric switch composed of a copper rod

10

cm long at

20 \

deg C is to touch an electrical contact at a temperature of

150 \

deg C

.

what distance should there be between the rod end and the contact at

20 \

deg C

,

if the copper thermal expansion

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