D. physical property
the bonds between molecules of mercury are breaking so it's physical and it's not changing the chemical composition of the substance
Answer:
200A
Explanation:
Given that
the distance between earth surface and power cable d = 8m
when the current is flowing through cable , the magnitude flux density at the surface is 15μT
when the current flow throught is zero the magnitude flux density at the surface is 20μT
The change in flux density due to the current flowing in the power cable is
B = 20μT - 15μT
B =5μT -----(1)
The expression of magnitude flux density produced by the current carrying cable is
-----(2)
Substitute the value of flux density
B from eqn 1 and eqn 2
![\frac{\mu_0I}{2\pi d}=5\times 10^-^6\\\\\frac{(4\pi \times 10^-^7)I}{2 \pi (8)} =5\times 10^-^6\\\\I=200A](https://tex.z-dn.net/?f=%5Cfrac%7B%5Cmu_0I%7D%7B2%5Cpi%20d%7D%3D5%5Ctimes%2010%5E-%5E6%5C%5C%5C%5C%5Cfrac%7B%284%5Cpi%20%5Ctimes%2010%5E-%5E7%29I%7D%7B2%20%5Cpi%20%288%29%7D%20%3D5%5Ctimes%2010%5E-%5E6%5C%5C%5C%5CI%3D200A)
Therefore, the magnitude of current I is 200A
Answer:
Newton's Second Law of Motion says that acceleration (gaining speed) happens when a force acts on a mass (object). Riding your bicycle is a good example of this law of motion at work. Your bicycle is the mass. Your leg muscles pushing pushing on the pedals of your bicycle is the force.
Explanation:
Protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge).