The electric field in a metal is zero in electrostatics. But in Rutherford gold foil experiment, alpha particles get deflected from the gold foil showing presence of electric field there. I discussed the question outside the forum and found the following answers which don't seem correct to me:
(a) Gold is not a metal but is a semi metal
(b) When alpha particle moves in gold, this is not an electrostatic situation.
(c) The moving alpha particle creates a magnetic field which shifts the electron clouds to create the electric field.
(d) The electric field inside a metal is zero only in an average sense.
(e) The alpha particles are deflected from the surface of the gold foil and electric field may exist at the surface of a metal.
What could be the possible explanation?