I'm going through my kaplan MCAT physics book and one of thequestions goes like this. They show a picture of two circles, onelabeled S and one labeled R, with a force vector extending from Sto R. The question asks:
"If an electron were placed midway between R and S the resultantelectric force on the electron would be:"
A) towards R
B) towards S
C) up
D) down
Due to the fact that the force vector was pointing towards R, Ireasoned that the two circles were unlike charges since they wereattracting each other, but it didn't seem to indicate whether R orS was positive or negative.
The answer at the back of the book says the electron will movetowards S because unlike charges attract and repelled by R becauselike charges repel. How did they deduce that S was positive and Rwas negative? Does it have to do with the fact that the forcevector is pointing away from S and towards R? I didn't think itmattered which direction the force vector was pointing.
Please forgive me if this is obvious, but physics is by far myworst subject for MCAT. I would appreciate your help!
I'm going through my kaplan MCAT physics book and one of thequestions goes like this. They show a picture of two circles, onelabeled S and one labeled R, with a force vector extending from Sto R. The question asks:
"If an electron were placed midway between R and S the resultantelectric force on the electron would be:"
A) towards R
B) towards S
C) up
D) down
Due to the fact that the force vector was pointing towards R, Ireasoned that the two circles were unlike charges since they wereattracting each other, but it didn't seem to indicate whether R orS was positive or negative.
The answer at the back of the book says the electron will movetowards S because unlike charges attract and repelled by R becauselike charges repel. How did they deduce that S was positive and Rwas negative? Does it have to do with the fact that the forcevector is pointing away from S and towards R? I didn't think itmattered which direction the force vector was pointing.
Please forgive me if this is obvious, but physics is by far myworst subject for MCAT. I would appreciate your help!
