I need help with wave on a string but wont let me put a link so you guy can see What can you change on the simulation?

In the top left corner are the settings: Manual, Oscillate and Pulse. What are the main differences between these functions?

Select Manual Setting. What are the two things *specific to the wave* that can be changed in this setting?

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2.

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e