問題詳情
13. 如圖所示，設有一垂直指向紙面的均勻磁場 B，在其界線 OS 的左邊無磁場。現有帶正電 q、質量為 m、速率 v 的粒子平行紙面以入射角θ射入此磁場，則該粒子在磁場內運動的軌跡長度為
(A) 
(B) 
(C) 
(D) 
參考答案
無參考答案
內容推薦
- The economists assert that the stock market crash may predict another wave of global ______.(A) a
- The politician’s action was severely criticized as a deliberate attempt to ______ the public.(A)
- Environmentalists believe that we ought to leave a clean and healthy environment for our ______
- Fourteen people, including performers and audience, were injured when the stage ______ in an out
- The practice, while considered unacceptable in big cities, was actually pretty common in ______
- More facilities for ______ and relaxation should be provided in the community to meet the needs o
- The most recent reports from climate scientists give us only a decade to reduce carbon ______ by
- An ______ number of fires were recorded in Brazil this year. There have never been so many fires
- The plant manager is considering buying a new grinding machine to replace the old one to ensure _
- An increasing number of college graduates are confident and ______ about landing their dream job.
內容推薦
- Inappropriate use of electronic gadgets is likely to ______ our sleep at night.(A) probe (B) indu
- Waking up with a hangover can be awful. The intense headache coupled with random waves of nausea
- The manufacturer used biodegradable materials as an ______ for plastic.(A) alternative (B) excur
- The tourist ______ with the vendor over the price of a small souvenir.(A) merged (B) haggled (C)
- We know that education increases cognitive ability, so it stands to reason that educational tele
- The Costco international stores in ten countries have proven that the Costco formula works just
- A measles outbreak in Samoa has killed 53 people and ______ 2% of the population.(A) infected (B
- The doorbell rang while David was running on the treadmill, so he immediately stopped ______ the
- ______ a rich background in foreign affairs and policies, he is considered a strong candidate fo
- Because of the bad weather, ______ a great holiday turned out to be a disaster.(A) it could be (
- Research suggests that there are some ______ ways in which we can think more creatively.(A) surp
- Amazon may be the gold star winner this Cyber Monday, especially thanks to ______ one-day shippi
- 第一篇：Our lives are connected to the climate. Human societies have adapted 31 the relatively sta
- I did not get enough sleep last night, ______ did some of my classmates.(A) hardly (B) and eithe
- I like the gift very much, but you really ______ spent so much money on me.(A) should not (B) ou
- In spite of what happened in the past two months, I don’t regret ______ here.(A) coming (B) to c
- I would have been in real trouble ______ my brother’s help.(A) if not (B) if has not (C) but tha
- ______ any concern about the matter, please feel free to contact us.(A) Were you have (B) If you
- 第二篇：Once limited to the professionals, sous vide is a cooking technique that utilizes precise temper
- 【題組】(A) affect (B) release (C) imitate (D) originate
- 第一篇： Technology is rapidly altering every aspect of the lives of human beings and extending the
- 【題組】According to the passage, which of the following can cause inefficient access to natural res
- 【題組】According to the passage, which of the following may contribute to the saving of time?(A) Le
- 【題組】According to the passage, which of the following can result in less employment of human labo
- 【題組】(A) past (B) pending (C) coming (D) preceding