Copper

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Location : Important useful device for family planning in uterus of female.
Function : Releases metal ion which possesses strong antifertility quality prevents pregnancy.
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Cross-sectional area of a Copper wire is equal to area of a square of length 2 mm. If this copper wire draws 8 A electric current, then find the drift velocity of free electron. Number density of electron in Copper wire is 8 xx 10^(28) m^(-3)

A current of 1.34A exists in a copper wire of cross-section 1.0mm^(2) . Assuming eac copper atom contributes one free eectron. Calculate the drift speed of the free electrons in the wire. The density of copper is 8990 kg// m^(3) and atom ic mass=63.50.

Every atom makes one free electron in copper. If 1.1 ampere current is flowing in the wire of copper having 1 mm diameter, then the drift velocity (approx.) will be (Density of copper =9 xx 10^(3) kg m^(-3) and atomic weight = 63)