We know, F = k * q₁ * q₂ / r²
Substitute the known values,
F = 9 * 10⁹ * 5 * 7 / (1.2)²
F = 315 * 10⁹ / 1.44
F = 218.75 * 10⁹ N
F = 2.1875 * 10¹¹ N [ Final Answer ]
Hope this helps!
Answer:
The answer is C. thinking about the smallest particles of matter without experimenting.
Answer:
The magnetic field is 
Explanation:
From the question we are told that
The inner radius is 
The outer radius is 
The distance from the axis of the conductor is 
The current carried by the conductor is 
According to Ampere's circuital law , the magnetic field at a point that is
from the axis of the conductor
![B = \frac{\mu_oI}{2 \pi d } [\frac{d - r_1}{r_2 -r_1} ]](https://tex.z-dn.net/?f=B%20%3D%20%20%5Cfrac%7B%5Cmu_oI%7D%7B2%20%5Cpi%20d%20%7D%20%5B%5Cfrac%7Bd%20-%20r_1%7D%7Br_2%20-r_1%7D%20%5D)
Where
is the permeability of free space with a value of
substituting values
![B = \frac{(4 \pi *10^{-7})(80)}{2 * 3.142 * 2 *10^{=3} } [\frac{(2^2 - 1 ^2 )*10^{-3}}{(3^2 - 1^2) *10^{-3}} ]](https://tex.z-dn.net/?f=B%20%3D%20%20%5Cfrac%7B%284%20%5Cpi%20%2A10%5E%7B-7%7D%29%2880%29%7D%7B2%20%2A%203.142%20%2A%202%20%2A10%5E%7B%3D3%7D%20%7D%20%5B%5Cfrac%7B%282%5E2%20-%201%20%5E2%20%29%2A10%5E%7B-3%7D%7D%7B%283%5E2%20-%201%5E2%29%20%2A10%5E%7B-3%7D%7D%20%5D)

Answer:
h = 40.37 m
Explanation:
We will apply the law of conservation of energy to the skier in this case, as follows:

where,
m = mass of skier = 77 kg
g = acceleration due to gravity = 9.81 m/s²
vf = final speed = 30 m/s
vi = initial speed = 2 m/s
W_friction = Work done by friction and air resistance = 4000 J
Therefore,
![(77\ kg)(9.81\ m/s^2)h = \frac{1}{2}(77\ kg)[(30\ m/s)^2-(2\ m/s)^2] - 4000\ J\\\\h = \frac{34496\ J - 4000\ J}{755.37\ N}\\\\](https://tex.z-dn.net/?f=%2877%5C%20kg%29%289.81%5C%20m%2Fs%5E2%29h%20%3D%20%5Cfrac%7B1%7D%7B2%7D%2877%5C%20kg%29%5B%2830%5C%20m%2Fs%29%5E2-%282%5C%20m%2Fs%29%5E2%5D%20-%204000%5C%20J%5C%5C%5C%5Ch%20%3D%20%5Cfrac%7B34496%5C%20J%20-%204000%5C%20J%7D%7B755.37%5C%20N%7D%5C%5C%5C%5C)
<u>h = 40.37 m</u>