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Practice MCAT Question - Q19 - Answer!

What is the charge on a body that has an excess of 20 electrons?

A.  3.2 x 10-18 C
B.  1.6 x 10-18 C
C.  3.2 x 10-19 C
D.  2.4 x 10-19 C

The correct answer is (A). The elementary charge e is 1.6 x 10-19 C. Therefore, 20 electrons have a total magnitude of:

20(1.610-19 C) = 3.2 x 10-18 C

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