Acurrent of 0.86 a flows through a copper wire 0.47 mm in diameter when it is connected to a potential difference of 15 v. how long is the wire?
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Ответ:
To calculate the length of the wire, we use formulas,
Here, R is the resistance of the wire, I is the current flows through wire and V is potential difference. A is cross sectional area of wire and
is the density of copper wire and is value,
.
Given![I = 0.86 A,V=15 V and r = \frac{0.47 mm}{2} =2.35 \times 10^{-4} m, V= 15 V.](/tpl/images/0076/3125/c8504.png)
Substituting the values of I and V in equation (A ) we get,
Now from equation (B),
Therefore,
Thus the length of the copper wire is 177.9 m.
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