The re<span>sistance of the second wire is 16 R.
where R is the resistance of the first wire.
R = </span>ρ
![\frac{l}{A}](https://tex.z-dn.net/?f=%20%5Cfrac%7Bl%7D%7BA%7D%20)
where l = length of the wire
A = area of the wire
A =
![\pi r^{2}](https://tex.z-dn.net/?f=%20%5Cpi%20r%5E%7B2%7D%20)
where, r =
![\frac{diameter of wire}{2}](https://tex.z-dn.net/?f=%20%5Cfrac%7Bdiameter%20of%20wire%7D%7B2%7D%20)
Thus, on finding the ratio of resistance of the two wires, we get,
![\frac{R1}{R2} = \frac{l1A2}{l2A1}](https://tex.z-dn.net/?f=%20%5Cfrac%7BR1%7D%7BR2%7D%20%3D%20%20%5Cfrac%7Bl1A2%7D%7Bl2A1%7D%20%20)
here, R1 = R
l1 = 8m
l2 = 2m
A1=π
![0.25^{2}](https://tex.z-dn.net/?f=%200.25%5E%7B2%7D%20)
A1=π
![0.50^{2}](https://tex.z-dn.net/?f=%200.50%5E%7B2%7D%20)
we get. R2 = 16R
Complete question:
A long, straight wire lies along the z-axis and carries a 4.00-A current in the +z-direction. Find the magnetic field (magnitude and direction) produced at the following points by a 0.500-mm segment of the wire centered at the origin:
(a) x = 2.00 m, y = 0, z = 0;
(b) x = 0, y = 2.00 m, z = 0;
(c) x = 2.00 m, y = 2.00 m, z = 0; (d) x = 0, y = 0, z = 2.00 m.
Answer:
a)
;
b)
;
c)
;
d) 0
Explanation:
Given
I = 4.20A
P = 0.500mm
a) r= (2.00m) i
∆
;
;
b) r = (2.00m) j
∆
;
;
c) r = (2.00m) (i+j)
;
∆
;
;
d) r = (2.00m) k
∆
;
B = 0
The blu-ray standard that defines rewritable disks is BD-RE which stands for Blu-ray Disc Recordable.
<h3>
What is BD-RE?</h3>
BD-RE stands for Blu-ray Disc Recordable and it refers to two direct to disc optical disc recording technologies that can be recorded on to a Blu-ray-based optical disc with an optical disc recorder.
Thus, the blu-ray standard that defines rewritable disks is BD-RE which stands for Blu-ray Disc Recordable.
Learn more about blu-ray here: brainly.com/question/16794951
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