Explain why equipotential surfaces are always perpendicular to ...

[wrbasek0]

Explain why equipotential surfaces are always perpendicular to the electric field vectors.
 
  What will be an ideal response?

Question 2

You are driving a late model convertible at the 55 mph limit with its soft ragtop roof up and the windows closed. You observe that the roof
 
  A)
 
  bows inward.
  B)
 
  is not changed from when the car was at rest.
  C)
 
  bows outward.
  D)
 
  bows inward only when you are driving uphill.
  E)
 
  bows inward only when you are driving downhill.

[jamesnevil303]

Answer to Question 1

If the electric field is not perpendicular to an equipotential, the field would do work on a charge that moves along the equipotential. In this case, the potential energy of the charge would change, and the surface would not in fact be an equipotential.

Answer to Question 2

C

[wrbasek0]

Both answers were spot on, thank you once again

[jamesnevil303]

Great! Please up vote