A.- The electric force between two identical point charges, of charge +Q each, fixed: distance D is F. If a +Q/4 charge

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A.- The electric force between two identical point charges, of charge +Q each, fixed: distance D is F. If a +Q/4 charge was extracted
of one of them and is transferred to the other, keeping both at the same distance, the new electric force between them is:
a) 3F/4
b) 5F/4
c) 15F/16
d) 16F/15
c) 4F
B.- Two point charges +Q and -Q meet respectively (-a,0) and (3a,0). What is the electric field at the origin?
a) E=kQ/a^2 i
b) E=-kQ/a^2 i
c) E=kQ/9a^2 i
d) E=10kQ/9a^2 i
e) E=-10kQ/9a^2 i
C.- A charge +Q of mass m and another -Q of mass m/3 are found in a region with a uniform electric field. If the acceleration of +Q
is d, then the acceleration of -Q is:
a)-3a
b) 3a
c) -a
d) -a/3
e) a/3