Answer:
In short, there are four types of natural silk produced around the world: Mulberry silk, Eri silk, Tasar silk and Muga silk. Mulberry silk contributes around as much as 90% of silk production, with the mulberry silkworm generally being regarded as the most important.
If the substance doesn't change chemically, it is a physical reaction.
Wave speed = frequency * wavelength
Wave speed = 4 * 25
Wave speed = 100 m/s
Answer:
a) -2.516 × 10⁻⁴ V
b) -1.33 × 10⁻³ V
Explanation:
The electric field inside the sphere can be expressed as:
![E= \frac{kqr}{R^3}](https://tex.z-dn.net/?f=E%3D%20%5Cfrac%7Bkqr%7D%7BR%5E3%7D)
The potential at a distance can be represented as:
V(r) - V(0) = ![-\int\limits^r_0 {\frac{kqr}{R^3} } \, dr^2](https://tex.z-dn.net/?f=-%5Cint%5Climits%5Er_0%20%7B%5Cfrac%7Bkqr%7D%7BR%5E3%7D%20%7D%20%5C%2C%20dr%5E2)
V(r) - V(0) =
₀
V(r) =
₀
Given that:
q = +3.83 fc = 3.83 × 10⁻¹⁵ C
r = 0.56 cm
= 0.56 × 10⁻² m
R = 1.29 cm
= 1.29 × 10⁻² m
E₀ = 8.85 × 10⁻¹² F/m
Substituting our values; we have:
![= -\frac{(3.83*10^{-15}C)(0.560*10^{-2}m)^2}{8 \pi (8.85*10^{-12}F/m)(1.29*10^{-2}m)^3}](https://tex.z-dn.net/?f=%3D%20-%5Cfrac%7B%283.83%2A10%5E%7B-15%7DC%29%280.560%2A10%5E%7B-2%7Dm%29%5E2%7D%7B8%20%5Cpi%20%288.85%2A10%5E%7B-12%7DF%2Fm%29%281.29%2A10%5E%7B-2%7Dm%29%5E3%7D)
= -2.15 × 10⁻⁴ V
The difference between the radial distance and center can be expressed as:
V(r) - V(0) = ![-\int\limits^R_0 {\frac{kqr}{R^3} } \, dr^2](https://tex.z-dn.net/?f=-%5Cint%5Climits%5ER_0%20%7B%5Cfrac%7Bkqr%7D%7BR%5E3%7D%20%7D%20%5C%2C%20dr%5E2)
V(r) - V(0) = ![[\frac{qr^2}{8 \pi E_0R^3 }]^R](https://tex.z-dn.net/?f=%5B%5Cfrac%7Bqr%5E2%7D%7B8%20%5Cpi%20E_0R%5E3%20%7D%5D%5ER)
V(r) = ![-\frac{qR^2}{8 \pi E_0R^3 }](https://tex.z-dn.net/?f=-%5Cfrac%7BqR%5E2%7D%7B8%20%5Cpi%20E_0R%5E3%20%7D)
V(r) = ![-\frac{q}{8 \pi E_0R }](https://tex.z-dn.net/?f=-%5Cfrac%7Bq%7D%7B8%20%5Cpi%20E_0R%20%7D)
V(r) ![= -\frac{(3.83*10^{-15}C)}{8 \pi (8.85*10^{-12}F/m)(1.29*10^{-2}m)}](https://tex.z-dn.net/?f=%3D%20-%5Cfrac%7B%283.83%2A10%5E%7B-15%7DC%29%7D%7B8%20%5Cpi%20%288.85%2A10%5E%7B-12%7DF%2Fm%29%281.29%2A10%5E%7B-2%7Dm%29%7D)
V(r) = -0.00133
V(r) = - 1.33 × 10⁻³ V