Three point charges, Q1, Q2, and Q3, are located in a straight line, separated by finite distances 'a' and 'b' as illustrated. Indicate which of the charges could possibly have a total electrostatic force of 0. The spacings and magnitudes of the charges may be varied to MAXIMIZE the number of charges with 0 force.
none
Q1
Q2
Q3
a
b
Q2
Q1
Q2
Q3
a
b
Q1&Q2&Q3
Q1
Q2
Q3
a
b
Q1&Q2&Q3
Q1
Q2
Q3
a
b
Q1
Q1
Q2
Q3
a
b