(a) Find the electric potential at points a and b for charges of + 4.2nC and 6.4nC...

(a) Find the electric potential at points a and b for charges of + 4.2nC and ˆ’ 6.4nC located as shown in the figure.
(b) What is the potential difference Δ V for a trip from a to b?
(c) How much work must be done by an external agent to move a point charge of + 1.50nC from a to b?

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12.0 cm 12.0 cm 15.9 cm 12.0 cm 6.0 cm