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Question
A system has two charges qA = 2.5 × 10−7 C and qB = −2.5 × 10−7 C located at points A: (0, 0, −15 cm) and B: (0, 0, +15 cm), respectively. What are the total charge and electric dipole moment of the system?
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Solution
qnet = qA + qB
qnet = 2.5 × 10−7 + (−2.5 × 10−7)
= 2.5 × 10−7 − 2.5 × 10−7
= 0
Distance between two charges at points A and B,
d = 15 + 15
= 30 cm
= 0.3 m
The electric dipole moment of the system is given by,
p = qA × d = qB × d
= 2.5 × 10−7 × 0.3
= 7.5 × 10−8 C m directed along BA
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