You observe that a negatively charged plastic pen repels a charged piece of magi

Question

You observe that a negatively charged plastic
pen repels a charged piece of magic tape. You
then observe that the same piece of tape is re-
pelled when brought near a metal sphere. You
are wearing rubber soled shoes, and you touch
the metal sphere with your hand. After you
touch the metal sphere, you observe that the
tape is attracted to the metal sphere. Which
of the following statements could be true. List
all that apply, separated by commas. If none
apply, type “none”.
A. Electrons from the sphere traveled
through your body into the earth.
B. Electrons from the sphere moved into
the salt water on your skin, where they
reacted with sodium ions.
C. After you touched it, the metal sphere
was very nearly neutral.
D. Chloride ions from the salt water on your
hand moved onto the sphere.
E. The excess negative charge from the
sphere spread out all over your body.
F. Electrons from your hand moved onto
the sphere.
G. Sodium ions from the salt water on your
hand moved onto the sphere.

Explanation / Answer

When you touched the sphere, charge was transferred to you in the form of electrons. In order to minimize electron-electron repulsion, this charge is distributed uniformly within your body The answer is D

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