选择 2026 Jun P1 Q29 1 分 4.2.3 Electromotive force and potential difference4.5.4 Force on a current-carrying conductor 查看题目与答案
选择 2026 Jun P1 Q35 1 分 4.5.4 Force on a current-carrying conductor4.5.3 Magnetic effect of a current 查看题目与答案