Chapter 22, Problem 1 from Physics for Scientists and Engineerswith Modern Physi

Question

Chapter 22, Problem 1 from Physics for Scientists and Engineerswith Modern Physics (4th)
I am having trouble doing this problem, here is thequestion
A uniform electric field of magnitude 5.8*10^2 N/C passesthrough a circle of radius 13 cm. What is the electric flux throughthe circle when its face is A.) perpendicular to field lines
                                                                                               B.) at 45 degrees to the field lines
                                                                                                 C.) parallel to the field lines

Explanation / Answer

flux = E field * area * cosine of angle    so . (a)   flux = 580 * *0.132 cos0 =   30.79 N-m2 /C . (b)    flux = 580 * *0.132 cos45 =   21.77 N-m2 / C . (c)    flux = 580 * *0.132 cos90 =   0

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