SAT2物理题及答案分享

　　下面给大家分享的是两道SAT2物理题及答案。大家在备考SAT2物理考试的过程中，一定要注重方法的积累。

　　The set of lettered choices below refers to multiple questions. Select the one lettered choice that best answers each question. A choice may be used once, more than once, or not at all in each set.

　　This question relates to a point charge fixed in position, as shown in the diagram. Five points near the charge and in the plane of the page are shown.

　　At which point will the magnitude of the electric field be least?

　　Answer Choices

　　(A) Point A

　　(B) Point B

　　(C) Point C

　　(D) Point D

　　(E) Point E

　　The correct answer is D

　　Explanation

　　Difficulty: Easy

　　The correct answer is point D because it is farthest away from the point charge. The magnitude of the electric field E at any location due to a point charge is inversely proportional to the square of the distance r from the location to the charge,, so the greater the distance, the less the magnitude of the electric field.

　　This question relates to a point charge + Q fixed in position, as shown in the diagram. Five points near the charge and in the plane of the page are shown.

　　At which point will an electron experience a force directed toward the top of the page?

　　Answer Choices

　　(A) A

　　(B) B

　　(C) C

　　(D) D

　　(E) E

　　The correct answer is E

　　Explanation

　　Difficulty: Easy

　　The correct answer is point E, which is directly below the point charge + Q. The electron is negatively charged and since unlike charges attract, it will always experience a force directed straight toward the charge + Q, which is fixed in position. The only labeled point where a force toward + Q is directed toward the top of the page is point E.

　　以上就是两道SAT2物理题的全部内容，希望对大家的备考有所帮助！