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(a) What is the direction of the total Coulomb force on q in Figure 18.46 if q is negative, qa= qand both are negative, and qb= qand both are positive? (b) What is the direction of the electric field at the center of the square in this situation?

(a) What is the direction of the total Coulomb force on q in Figure 18.46 if q is negative, qa= qand both are negative, and qb= qand both are positive? (b) What is the direction of the electric field at the center of the square in this situation?

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Can I ask for help for this one? Specifically what does the FBD look like? I'm kinda confused that qc is both positive and negative. 

Textbook Problem (a) What is the direction of the total Coulomb force on q in Figure 18.46 if q is negative, qa= qand both are negative, and qb= qçand both are positive? (b) What is the direction of the electric field at the center of the square in this situation? qa b. Figure 18.46 Four point charges qa. 9b· ¶c , and qa lie on the corners of a square and q is located at its center.
Transcribed Image Text:Textbook Problem (a) What is the direction of the total Coulomb force on q in Figure 18.46 if q is negative, qa= qand both are negative, and qb= qçand both are positive? (b) What is the direction of the electric field at the center of the square in this situation? qa b. Figure 18.46 Four point charges qa. 9b· ¶c , and qa lie on the corners of a square and q is located at its center.
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