Coulomb's Law (Electric Force) Video Lessons

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Problem: Three charges, q1, q2 and q3 are placed left to rigth in a straight line. The distance between q1 and q2  is twice the distance between q 2 and q3. Charge q1 is negative. If the force on charge q3 is zero, which of the following statements about q 2 is true? A) q2 is negative with a magnitude twice that of q 1 B) q2 is negative with a magnitude half that of q 1 C) q2 is positive with a magnitude one fourth that of q 1 D) q2 is positive with a magnitude one ninth that of q 1 E) q2 is positive with a magnitude equal that of q 1

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Problem Details

Three charges, q1, q2 and q3 are placed left to rigth in a straight line. The distance between q1 and q2  is twice the distance between q 2 and q3. Charge q1 is negative. If the force on charge q3 is zero, which of the following statements about q 2 is true?

A) q2 is negative with a magnitude twice that of q 1

B) q2 is negative with a magnitude half that of q 1

C) q2 is positive with a magnitude one fourth that of q 1

D) q2 is positive with a magnitude one ninth that of q 1

E) q2 is positive with a magnitude equal that of q 1

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Based on our data, we think this problem is relevant for Professor Rappel's class at UCSD.