A system has two charges $q_{A} = 2 .5 \times 10^{- 7} C$ and $q_{B} = - 2 .5 \times 10^{- 7} C$ located at points A(0,0,–15 cm) and B:(0,0,+15cm), respectively. What are the total charge and electric dipole moment of the system

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q=2C,P=8×10^–8C-m along Z-axis

q=0,P=7.5 ×10^–8C-m along Z-axis

q=0.01C, P=0.8×10^–8C-m along Z-axis

q=0.1C,P=75×10^–8C-m along Z-axis

answer is A.

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Detailed Solution

$\begin{array}{l} q = q_{A} + q_{B} = 2 .5 \times 10^{- 7} - 2 .5 \times 10^{- 7} = 0 \\ p = q \times 2 a = 2 .5 \times 10^{- 7} \times 30 \times 10^{- 2} \\ = 7 .5 \times 10^{- 8} Cm along z -axis \end{array}$

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