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For the system shown in the figure, a = 60 cm, b = 80 cm, Q = -4.0 nC, and q = 1.5 nC.
(a) Find the magnitude of the electric field at point A and show its direction using an arrow in the figure.
[10 marks]
A
-!
B+ -
9
(b) Find the electric potential due to two charges at point A, assuming the potential to be zero at infinity.
What is the potential difference VB - VA?

For the system shown in the figure a 60 cm b 80 cm Q 40 nC and q 15 nC a Find the magnitude of the electric field at point A and show its direction using an arr class=

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