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The naturally occurring charge on the ground on a fine day out in the open country is $-1.00 \mathrm{nC} / \mathrm{m}^{2}$ . (a) What is the electric field relative to ground at a height of 3.00 $\mathrm{m} ?$ (b) Calculate the electric potential at this height. (c) Sketch electric field and equipotential lines for this scenario.

a) $-1.13 \times 10^{2} \mathrm{N} / \mathrm{C}$b) $-3.39 \times 10^{2} \mathrm{V}$c) The electric field will be perpendicular and pointing towards the ground as the ground has negative charge.

Physics 102 Electricity and Magnetism

Chapter 19

Electric Potential and Electric Field

Electric Charge and Electric Field

Gauss's Law

Electric Potential

Cornell University

University of Michigan - Ann Arbor

University of Winnipeg

Lectures

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In physics, potential ener…

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$A-10.0$ nC point charge a…

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SSM The electric field in …

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The electric potential in …

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Earth has a net charge tha…

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A closed surface with dime…

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Two $2.00-\mu \mathrm{C}$ …

04:19

In fair weather, over flat…

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A point charge $q_1 =$ 4.0…

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$A \quad$ positive point c…

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Charge of uniform surface …

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The two charges in Figure …

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The electric field at the …

04:18

The electric field at a di…

05:28

Two stationary point charg…

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22.10. A point charge $q_{…

$A+2.00-n C \quad$ point c…

06:40

Consider two thin, conduct…

so to solve this question, they need to know the charge Perimeter area that means charged density surface Josh Density Sigma Surface Judge density That means charge per unit. Alia Now electric field in terms of surface charged density is given as Sigma divided by Absalon Not so we arguing Sigma that his negative one Nano Kalume negative 1.90 cologne for me to square So all we have to do is converted toe Coolum per meter square on Absolutely not has a value 8.8 by times 10 power in 8 to 12. So let's perform this calculation when divided by 8.85 This will give us negative Want 1 12 new turn for Coolum or more per meter Any unit is okay. In the second part we are asked to find the electric potential Electric potential is given by electrics Field strength times the distance so it will be negative. I'm sorry, I should right here. That's 1 13 because answer. My calculator is 1 12.9 So let's approximate it to three significant digits as 1 13 So and see that it's negative as well. So let's use the same value bunco team times the these three meters. So 1 13 times three will be 339 Vote on in part. See, we are asked to sketch electric field and every potential line from this surface. Okay, so for small for good approximation, we can assume that the earth is flat enough because all we can see is flat out of the road because we all see the small part of the earth and authors Huge radius, which is 6400 kilometers. So for a small area, it's ah good approximation to consider it flat. In that case, electric field will be parallel to each other. These are the electric field lines and all of them point down because electric field is negative on DDE. As you can see, if you drop perpendicular line, tow these lines. These are the equal potential surfaces it. So I'm using abbreviations for that equal creep potential surface. So if you consider that now big curvature, instead of that which will be like this electric field all pointing towards the centre of the earth in this case, or to the perpendicular to the surface to be precise than the electric. But equal potential lines will look like this. These are not with three potential lines or surface

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