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# Four closed surfaces, $S_{1}$ through $S_{4},$ together with the charges $-2 Q, Q,$ and $-Q,$ aresketched in Figure $P 15.47$ (The colored lines are the intersections of the surfaceswith the pagc.) Find the clec-tric flux through cach surface.

## Therefore, the electric flux associated with the closed surface is $0 .$

### Discussion

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##### Christina K.

Rutgers, The State University of New Jersey

##### Andy C.

University of Michigan - Ann Arbor

LB
##### Marshall S.

University of Washington

### Video Transcript

electric flux through a closed surface is given by flocks is a call to that amount of charges enclosed by a salon for ah, for a surface one, we have a neck. Charges are plus Q minus two Cube divided by a salon. This is a cold minus. Q. You have eight so long. This is for surface one for surf. It's too there that looks here from surface to knit flux easily the majority one. This is two minus. Q. Askyou minus cube your salon. So for surface to knit flux. Zero for surface three lif watch three isn't minus to kill plus Q minus. Q. Divide by salon. This isn't going to minus two. Q. Divided by a salon, this is the flux through surface three fucks through surface for these off Lux four. That is a cool two. Q. Net. Do you have a sawn unit? We have a zero divine Miss Long Excuse us zero

Wesleyan University
##### Christina K.

Rutgers, The State University of New Jersey

##### Andy C.

University of Michigan - Ann Arbor

LB
##### Marshall S.

University of Washington