Answer:
The current in the rods is 171.26 A.
Explanation:
Given that,
Length of rod = 0.85 m
Mass of rod = 0.073 kg
Distance ![d = 8.2\times10^{-3}\ m](https://tex.z-dn.net/?f=d%20%3D%208.2%5Ctimes10%5E%7B-3%7D%5C%20m)
The rods carry the same current in the same direction.
We need to calculate the current
I is the current through each of the wires then the force per unit length on each of them is
Using formula of force
![\dfrac{F}{L}=\dfrac{\mu_{0}I^2}{2\pi d}](https://tex.z-dn.net/?f=%5Cdfrac%7BF%7D%7BL%7D%3D%5Cdfrac%7B%5Cmu_%7B0%7DI%5E2%7D%7B2%5Cpi%20d%7D)
![\dfrac{mg}{L}=\dfrac{\mu_{0}I^2}{2\pi d}](https://tex.z-dn.net/?f=%5Cdfrac%7Bmg%7D%7BL%7D%3D%5Cdfrac%7B%5Cmu_%7B0%7DI%5E2%7D%7B2%5Cpi%20d%7D)
Where, m = mass of rod
l = length of rod
Put the value into the formula
![I^2=\dfrac{mgd}{\mu L}](https://tex.z-dn.net/?f=I%5E2%3D%5Cdfrac%7Bmgd%7D%7B%5Cmu%20L%7D)
![I^2=\dfrac{0.073\times9.8\times8.2\times10^{-3}}{2\times10^{-7}}](https://tex.z-dn.net/?f=I%5E2%3D%5Cdfrac%7B0.073%5Ctimes9.8%5Ctimes8.2%5Ctimes10%5E%7B-3%7D%7D%7B2%5Ctimes10%5E%7B-7%7D%7D)
![I=\sqrt{29331.4}](https://tex.z-dn.net/?f=I%3D%5Csqrt%7B29331.4%7D)
![I=171.26\ A](https://tex.z-dn.net/?f=I%3D171.26%5C%20A)
Hence, The current in the rods is 171.26 A.
The flow of charge is called "electric current".
Answer:
The approximate change in entropy is -14.72 J/K.
Explanation:
Given that,
Temperature = 22°C
Internal energy ![U=4.30\times10^{3}\ J](https://tex.z-dn.net/?f=U%3D4.30%5Ctimes10%5E%7B3%7D%5C%20J)
Final temperature = 16°C
We need to calculate the approximate change in entropy
Using formula of the entropy
![\Delta S=\dfrac{\Delta U}{T}](https://tex.z-dn.net/?f=%5CDelta%20S%3D%5Cdfrac%7B%5CDelta%20U%7D%7BT%7D)
Where,
= internal energy
T = average temperature
Put the value in to the formula
![\Delta S=\dfrac{-4.30\times10^{3}}{\dfrac{22+273+16+273}{2}}](https://tex.z-dn.net/?f=%5CDelta%20S%3D%5Cdfrac%7B-4.30%5Ctimes10%5E%7B3%7D%7D%7B%5Cdfrac%7B22%2B273%2B16%2B273%7D%7B2%7D%7D)
![\Delta S=-14.72\ J/K](https://tex.z-dn.net/?f=%5CDelta%20S%3D-14.72%5C%20J%2FK)
Hence, The approximate change in entropy is -14.72 J/K.
Answer:
A
Explanation:
i don't know but u think the answer is A