(a) Find an expression for the electric field on the y-axis due to the two charges q...
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(a) Find an expression for the electric field on the y-axis due to the two charges q in Fig. 20.7.(b) At what point is the field on the y-axis a maximum?
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-Net force F Force from q at a -Force from q at -a and this is the magnitude . . This is the y- component of the displacement vectors from ... so the y-components of both unit vectors are y q to Q ... Va + y² X=-a X=a FIGURE 20.7 The force on Q is the vector sum of the forces from the individual charges. r= Ja
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