핵심물리학2 전기파트 23단원 레포트답안

핵심물리학2 전기파트 23단원 레포트답안

핵심물리학2 전기파트 23단원 레포트답안.doc

본문 EXERCISES Section 24.1 Electric Current 14. The current is the amount of charge passing a given point in the wire, per unit time, so in one second, The number of electrons in this amount of charge is 15. INTERPRET This problem is about the number of charges involved in setting up an electric current. DEVELOP For a steady current, the amount of charge crossing a given area in time can be found by using Equation 24.1a, EVALUATE A battery rated at can supply a net charge of ASSESS By definition, or So the result makes sense. 16. The charge moving through the membrane each second is Since singly-charged ions carry one elementary charge (about this corresponds to (See Example 24.2(a), Appendix B, and Table 1.1.) Chemical drug-testing instrumentation can detect amounts of substances this low. 17. INTERPRET In this problem we are asked to find the current density, given the electric current and the cross section. DEVELOP The current density J, is defined as the current per unit area, or The area of the cross section is EVALUATE The cross section of a wire is uniform, so the density is ASSESS If the current I is kept fixed, the smaller the cross-sectional area A, the greater the current density J. Section 24.2 Conduction Mechanisms 18. Aluminum obeys Ohm's law, so (see Table 24.1). 19. INTERPRET In this problem we are asked to calculate the electric field in a current-carrying conductor. DEVELOP To find the electric field, we make use of Ohm's law (which applies to silver), and the definition of current density, which is assumed to be uniform in the wire. EVALUATE Using Table 24.1, we find the electric field to be ASSESS The value is a lot smaller than the electric field we discussed in electrostatic situations. Since silver is such a good conductor, a small field can drive a substantial current. 20. Assuming a uniform current density obeying Ohm's law, we find 하고 싶은 말 좀 더 업그레이드하여 자료를 보완하여, 과제물을 꼼꼼하게 정성을 들어 작성했습니다. 위 자료 요약정리 잘되어 있으니 잘 참고하시어 학업에 나날이 발전이 있기를 기원합니다 ^^ 구입자 분의 앞날에 항상 무궁한 발전과 행복과 행운이 깃들기를 홧팅 키워드 단원, 핵심, 레포트답안, 전기파트, 핵심물리학, 물리학