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120. A metal sphere has a - 6.4 x 10 -19 C charge.  This charge is created by an excess of 
     
A. 2 electrons 1 e- = - 1.6 x 10 -19 C

    
                                      1e-
- 6.4 x 10 -19 C x ---------------------- = 4 excess electrons
                              - 1.6 x 10 -19 C

    
The Correct Answer is C.
B. 2 protons
C. 4 electrons
D. 4 protons