Where is the dropdown menu
and where are the choices
- Courtney
1. A. The SI unit for current is the ampere.
2. C. The unit for resistance = ohm.
3. B. EMF is measured in volts.
4. B. Electric current is the flow of charged particles, i.e. electrons.
5. B or C. All other answers are metals.
6. C. The dimensions of a material don't affect its resistance.
7. D. Ohm's law: current = voltage / resistance, 12/4 = 3.
8. B. Batteries transform chemical energy into electrical energy.
9. A. Metals are generally good conductors.
Answer:
Simply put, slope refers to the steepness of a line. The larger the slope, the steeper the line. Slope is often referred to as 'rise over run' because it is calculated by the change in the vertical (rise) divided by the change in the horizontal (run). ... For example, a high value of slope means a very steep line.
Answer:
z = 1.16m
Explanation:
The electric field in a point of the axis of a charged ring, and perpendicular to the plane of the ring is given by:
z: distance to the plane of the ring
r: radius of the ring
Q: charge of the ring
you have that:
E_{z->0} = 0
E_{z->∞} = 0
To find the value of z that maximizes E you use the derivative respect to z, and equals it to zero:
![\frac{dE_z}{dz}=Q[\frac{1}{(z^2+r^2)^{3/2}}+z(-\frac{3}{2})\frac{1}{(z^2+r^2)^{5/2}}(2z)]=0\\\\(z^2+r^2)^{5/2}=3z^2(z^2+r^2)^{3/2}\\\\(z^2+r^2)^2=3z^4\\\\z^4+2z^2r^2+r^4=3z^4\\\\2z^4-2z^2r^2-r^4=0\\\\z^2_{1,2}=\frac{-(-2)+-\sqrt{4-4(2)(-1)}}{2(2)}=\frac{2\pm 3.464}{4}\\\\](https://tex.z-dn.net/?f=%5Cfrac%7BdE_z%7D%7Bdz%7D%3DQ%5B%5Cfrac%7B1%7D%7B%28z%5E2%2Br%5E2%29%5E%7B3%2F2%7D%7D%2Bz%28-%5Cfrac%7B3%7D%7B2%7D%29%5Cfrac%7B1%7D%7B%28z%5E2%2Br%5E2%29%5E%7B5%2F2%7D%7D%282z%29%5D%3D0%5C%5C%5C%5C%28z%5E2%2Br%5E2%29%5E%7B5%2F2%7D%3D3z%5E2%28z%5E2%2Br%5E2%29%5E%7B3%2F2%7D%5C%5C%5C%5C%28z%5E2%2Br%5E2%29%5E2%3D3z%5E4%5C%5C%5C%5Cz%5E4%2B2z%5E2r%5E2%2Br%5E4%3D3z%5E4%5C%5C%5C%5C2z%5E4-2z%5E2r%5E2-r%5E4%3D0%5C%5C%5C%5Cz%5E2_%7B1%2C2%7D%3D%5Cfrac%7B-%28-2%29%2B-%5Csqrt%7B4-4%282%29%28-1%29%7D%7D%7B2%282%29%7D%3D%5Cfrac%7B2%5Cpm%203.464%7D%7B4%7D%5C%5C%5C%5C)
you take the positive value:
hence, the distance in which the magnitude if the electric field is maximum is 1.16m
