(a) Consider the front surface of the trapezoidal box in Figure 24.22a, detached from the rest of the trapezoidal box. Does the field line flux through that surface increase, decrease, or stay the same if any of the following quantities is increased: 

(i) the area of the front surface, 

(ii) the magnitude of the electric field (keeping the area constant), 

(iii) the slope of the front surface (that is to say, the angle between the surface and the direction of the electric field is increased)?

(b) Does the electric flux through the front surface increase, decrease, or stay the same if any of these quantities is changed?

Transcribed Image Text:

Figure 24.22 Determining the electric flux through a flat surface. (a) Trapezoidal box in uniform electric field back surface front surface E (b) Vector areas of front and back surfaces A back E E Afront