3/24/2014 Electric Flux & Active Physics 11.7 Flux

Flux as a Function of Surface Angle

Measuring angles of the surface that electric flux(nail) going through.   

Recorded angles of the surface that include different number of flux(nail).  Use symmetry to determine the angles corresponding to negative flux after measure the angles of positive flux.   

 Plot of the flux as a function of radians.  The curve fit as cosine function.  

Active Physics 11.7 Flux

Question 1: Flux Into or Out of an Oval

Change the shapes of oval does affect the flux.  

The flux does not changes when move the center of the oval anywhere surrounds the charge.  

The flux=0 when the oval does not surrounds the change.  

The flux increase as magnitude of charge increases.  The sign of flux changes when the sign of charge change.  

Question 2: Electric Flux with Two Charges

Change the shape of the ring does not change the flux.  Change the position of the center of the ring surround charges does not change the flux; flux changed only if the number of charge inside the ring change.  The net charge inside the ring is the sum of total charges.

Question 3: First way to determine electric flux
The flux is doubled(tripled) when the electric charge inside the oval is double(triple).  The net electric flux  is directly proportional to the net charge inside the oval.
Equation: Φ = 4πkQin 

Question 4: Second way to determine electric flux
The net electric flux is directly proportional to the net number of electric field lines leaving or entering the oval.
Equation: Φ = Number of electric field lines times (1.89E10+4 N/C)