Q 1.9) A system has two charges qa = 2.5 x 10-7 C and qB -2.5 x 10-7C located at points A: (0,0,- 15 cm) and B: (0, 0, + 15 cm), respectively. What are the total charge and electric dipole moment lof the svstem?

 
 
 
 
Both the charges can be located in a coordinate frame of reference asS
shown in the given figure.
At A, amount of charge, qqA=2.5×107C
At B, amount of charge,
qB=2.5×107C
The total charge of the system,

q=qA+qB=2.5×107C2.5×107C=0
 
Distance between two charges at points A and B,
 
d= 15 + 15 = 30 cm = 0.3 m
 
Electric dipole moment of the system is given by,
 
null m along positive Z-axis
 
Therefore, the electric dipole moment of the system is7.5×108 C m along the positive z-axis.