Several exam questions I got stuck on

In summary, the conversation discusses different concepts related to electromagnetism and force. The first two statements mention confusion about the correct answer, while the third statement mentions the process of finding the answer. In conclusion, the conversation touches on the use of the flemings left hand rule, resolving forces, and applying the equation for electromotive force to find the correct answer.
  • #1
influx
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2) I am unsure why the answer is A.. I thought the answer would be C ( by using flemings left hand rule)

5) If we resolve forces, we get R - mg = mv^2/r , so R = mg + mv^2/r but this isn't the correct answer.. (the correct answer is D)

6) I know when lines of flux are cut, an EMF and therefore a current is induced but how do I get the answer?

thanks
 
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  • #2
2 Use d F = i d L x B on any segment dL around the coil but concentrate on the top, bottom & sides.

5. Consider force on the car due to gravity and force required by centripetal motion. How much does the bridge have to push against the car after you've done that?

6. Apply emf = - d(phi)/dt for all four possibilities. What is the sign of phi on coil X before any action is taken?
 
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FAQ: Several exam questions I got stuck on

What should I do if I get stuck on an exam question?

If you find yourself stuck on an exam question, the first thing you should do is take a deep breath and try to remain calm. Panicking will only make it harder for you to think clearly. Then, read the question carefully and make sure you understand what it is asking. If you are still stuck, skip the question and come back to it later. Sometimes, the answer will come to you after you have answered other questions.

Should I guess on a question I am stuck on?

It depends on the type of exam and the grading system. If there is no penalty for guessing, it may be worth taking a guess on a question you are stuck on. However, if there is a penalty for incorrect answers, it may be better to leave the question blank. Remember, a wrong answer will not only result in lost points, but it may also harm your confidence and focus for the rest of the exam.

How can I avoid getting stuck on exam questions in the future?

There are a few strategies you can use to avoid getting stuck on exam questions in the future. First, make sure you understand the material thoroughly before the exam. This will give you a better chance of recognizing the correct answer when you see it. Additionally, practice solving similar problems and questions before the exam. This will help you develop problem-solving skills and improve your speed and accuracy.

Should I ask the professor for help if I am stuck on an exam question?

If the exam allows for it, you may want to consider asking the professor for clarification if you are stuck on a question. However, keep in mind that the professor may not be able to provide you with the answer. They may only be able to clarify the question or point you in the right direction. Additionally, asking for help may take up valuable time, so make sure to use this option wisely.

What can I do to manage my time better during an exam?

Time management is crucial during an exam, especially if you find yourself stuck on a question. One way to manage your time better is to set a time limit for each question and stick to it. If you are stuck on a question, move on to the next and come back to it later if you have time. Another helpful strategy is to read through the entire exam before starting and prioritize the questions you feel most confident about. This will help you use your time more efficiently and avoid getting stuck on difficult questions.

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