This question is incomplete, the complete question is;
A high-resistance material is used as an insulator between the conductors of a length of coaxial cable. The resistance material, which forms a hollow tube, has an inner radius a and an outer radius b, and the insulator provides a resistance R between the conductors. If a second insulator, made of the same material and having the same length, is made with double both the inner radius and the outer radius of the first, what resistance would it provide between the conductors
a) (In2)R
b) 4R
c) R/(In2)
d) 2R
e) R
Answer: Option e) R is the correct answer.
Explanation:
Given that;
Inner radius = a
Outer radius = b
Conical Cylinder
∫dR = ∫(edr/2πrL)
R = e/2πL In e |ᵇₐ
R = e/2πL In(b/a) ------------- let this be equation 1
Taking a look at the second cone
a' = 2a
b' = 2a
R' = e/2πL In(2b/2a)
{L = L'}
R' = e/2πL In(b/a) -------let this be equation 2
now lets compare the two equation
R = e/2πL In(b/a)
R' = e/2πL In(b/a)
so R' = R
Therefore Option e) R is the correct answer.
Answer:
t = 121 nm
Explanation:
given,
silicon solar cell = n = 3.50
layer of silicon dioxide = n = 1.45
minimum coating of silicon layer thickness = ?
wavelength of reflection = 700 nm
using condition of destructive interference
n is refractive index of silicon
m is order of fringe
λ is wavelength
m = 0,1,2..
for minimum m = 0
t = 121 nm
hence, the minimum thickness of the coating is equal to t = 121 nm
Answer:
I = 3.6 kg•m²
Explanation:
Conservation of angular momentum
Let's assume CW is the positive direction
3.4(-6.1) + I(9.3) = 3.4(1.8) + I(1.8)
I(9.3 - 1.8) = 3.4(1.8 + 6.1)
I(7.5) = 3.4(7.9)
I = 3.4(7.9)/(7.5) = 3.5813333333...
Answer:
The liquid with the highest viscosity will reach the bottom last.
Explanation:
Viscosity is the measurement of the liquid or resistance of fluids to flow and it therefore measures its internal friction, as the liquid with high viscosity has its molecular structure gives it a high internal friction when it is moving, so it moves slowly, but the liquid with a lower viscosity has its molecular structure gives it a low internal friction and its resistance to the surface which pass on it is being lower, so it flows faster on the surface.