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
Check The Sidebar For Another Practice MCAT Question!! ----->
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
