Lab Report Day 10 - Electric Dipole and Flux

Van De Graff and Cylinder Cage

We first charge put a cylinder cage with aluminum foil inside. We predict which direction the aluminum foil will go. We predict that both aluminum will move.

What we observe is that only the outer foil will move. This happens because the flux of inside is zero. The number of electric field coming in  and electric out is the same, which makes no electrons flow in the inner.

The set-up

ActivePhysics

We do active physics 1-4, 5-9 in class (which we finish after class.)

Answers for Active Physics Electric Flux

Needle Seat

As long as the weight is separately uniformly, it will not hurt.

The needle stands for electric field line. The number of needles represents the strength of the flux.

We get a conclusion that the shape does not affect the flux. If we increase the number of charges, the flux will also be bigger.

Conclusion

In today's class, we learn what is the electric flux. The bigger the surface area, the larger the flux.