The figure below shows the instant when a hollow metal box is placed in a uniform electric field, and its effect on the external field is not shown.
a. Indicate the electric charge distribution in the metal due to the external electric field. Note: If electrons move from one part of the box to another, the part with a deficiency of negatively charged electrons is now positively charged, and the part with an excess of electrons is negatively charged.
b. Draw electric field lines caused by this induced-charge distribution on the surface of the box and discuss the magnitude of the total field inside the box.
I know from the answer that the magnitude of the total field inside the box is zero, but I don't know why.
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