(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A vertical electric field of magnitude 2 X 10^4 N/C exists above the Earth's surface on a day when a thunderstorm is brewing. A car with a rectangular size of 3.00 m by 1.50 m is traveling along a dry gravel roadway sloping downward at 7.0°. Determine the electric flux through the bottom of the car.

2. Relevant equations

Eflux = E*(A cos theta)

3. The attempt at a solution

(2*10^4)*(3*1.5)*(cos 7) = 89,329 Nm^2/C = 8.93*10^4 Nm^2/C

Is this correct? It seems pretty straightforward to me, but I can't help think that there is some trick in the question that I'm not seeing.

Flux through a surface perpendicular to the electric field obviously has cos 90 = 0 as the angle angle associated with it so it would just be Eflux = E*A, but there is an angle here, so it would simply be cos 7. Does the thunderstorm brewing have any bearing on the equations affecting the answer?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Calculating electric flux with a constant electric field

**Physics Forums | Science Articles, Homework Help, Discussion**