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babyraerae06
05.10.2020 •
Physics
g The current through a 10 m long wire has a current density of 4 cross times 10 to the power of 6 space open parentheses bevelled A over m squared close parentheses. The wire conductivity is 2 cross times 10 to the power of 7 space open parentheses bevelled S over m close parentheses. Find the voltage drop across the wire. (Answer with the numeric value, don't write the unit V)
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Ответ:
The value is![V = 2 V](/tpl/images/0788/2753/bcee2.png)
Explanation:
From the question we are told that
The length of the wire is![l = 10 \ m](/tpl/images/0788/2753/d7848.png)
The current density is![J = 4*10^6 \ A/m^2](/tpl/images/0788/2753/ca6fe.png)
The conductivity is![\sigma = 2*10^{7} \ S/m](/tpl/images/0788/2753/0cd5a.png)
Generally conductivity is mathematically represented as
Here R is the resistance which is mathematically represented as
Here I is the current which is mathematically represented as
So
And
=>![\sigma = \frac{l}{\frac{V}{J}}](/tpl/images/0788/2753/74763.png)
=>![V = \frac{l * J}{\sigma }](/tpl/images/0788/2753/290c0.png)
=>![V = \frac{10 * 4*10^6}{2*10^{7} }](/tpl/images/0788/2753/8b1a3.png)
=>![V = 2 V](/tpl/images/0788/2753/bcee2.png)
Ответ:
1. C
2. D
3. A
4. B
5. B
6. B
7. A
8. A