Explanation:
Formula for angle subtended at the center of the circular arc is as follows.
![\theta = \frac{S}{r}](https://tex.z-dn.net/?f=%5Ctheta%20%3D%20%5Cfrac%7BS%7D%7Br%7D)
where, S = length of the rod
r = radius
Putting the given values into the above formula as follows.
![\theta = \frac{S}{r}](https://tex.z-dn.net/?f=%5Ctheta%20%3D%20%5Cfrac%7BS%7D%7Br%7D)
= ![\frac{4}{2}](https://tex.z-dn.net/?f=%5Cfrac%7B4%7D%7B2%7D)
= ![2 radians (\frac{180^{o}}{\pi})](https://tex.z-dn.net/?f=2%20radians%20%28%5Cfrac%7B180%5E%7Bo%7D%7D%7B%5Cpi%7D%29)
= ![114.64^{o}](https://tex.z-dn.net/?f=114.64%5E%7Bo%7D)
Now, we will calculate the charge density as follows.
![\lambda = \frac{Q}{L}](https://tex.z-dn.net/?f=%5Clambda%20%3D%20%5Cfrac%7BQ%7D%7BL%7D)
= ![\frac{18 \times 10^{-9} C}{4 m}](https://tex.z-dn.net/?f=%5Cfrac%7B18%20%5Ctimes%2010%5E%7B-9%7D%20C%7D%7B4%20m%7D)
= ![4.5 \times 10^{-9} C/m](https://tex.z-dn.net/?f=4.5%20%5Ctimes%2010%5E%7B-9%7D%20C%2Fm)
Now, at the center of arc we will calculate the electric field as follows.
E = ![\frac{2k \lambda Sin (\frac{\theta}{2})}{r}](https://tex.z-dn.net/?f=%5Cfrac%7B2k%20%5Clambda%20Sin%20%28%5Cfrac%7B%5Ctheta%7D%7B2%7D%29%7D%7Br%7D)
= ![\frac{2(9 \times 10^{9} Nm^{2}/C^{2})(4.5 \times 10^{-9}) Sin (\frac{114.64^{o}}{2})}{2 m}](https://tex.z-dn.net/?f=%5Cfrac%7B2%289%20%5Ctimes%2010%5E%7B9%7D%20Nm%5E%7B2%7D%2FC%5E%7B2%7D%29%284.5%20%5Ctimes%2010%5E%7B-9%7D%29%20Sin%20%28%5Cfrac%7B114.64%5E%7Bo%7D%7D%7B2%7D%29%7D%7B2%20m%7D)
= 34.08 N/C
Thus, we can conclude that the magnitude of the electric eld at the center of curvature of the arc is 34.08 N/C.
Answer:
I think is D I'm sorry if I'm wrong
Answer:
hope you like it mark as brainliest
Explanation:
Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact.
The coefficient of friction (fr) is a number that is the ratio of the resistive force of friction (Fr) divided by the normal or perpendicular force (N) pushing the objects together. It is represented by the equation: fr = Fr/N.