Answer Happy

1. The lab introduced you to Faraday's law, in which a changing flux causes an electromotive force (EMF.) What are some sci-fi or real life exmaples where this effect is used? (Hint: this is a researched oriented question. Look something up and talk about that.) 2. As a reminder, the Lorentz Force for magnetic fields is defined as: quBsine (1) Where q is the charge, v is the speed, B is the magnetic field, and is the angle between the particle and the magnetic field. Calculate the work done on an electron by a 2 Tesla magnetic field at an angle of 30 degrees over a 2 meter path. Assume the electron is traveling at the speed of light. FB = 3. The previous question has some giant errors that you may be familiar with. It turns out magnetic fields CANNOT do work. Ever. 0. Zilch. There are some complicated reasons for this, but try to use Faraday's law as an example. The magnetic field induces an EMF, which causes a current. How might that current be used to explain what's doing the work in an electromagnetic situation? 4. A compass is used to navigate north and south by aligning with the magnetic field of the earth. Does this therefore mean a compass can be used to detect other magnetic fields? If it can, would that mean the magnetic field it detects is stronger than the Earth's? 5. Einstein built his theory of special relativity off the back of Electromagnetism. This may seem strange, but by this point you may already know that a current can be the source of a magnetic field. But current is simply a bunch of electrons moving through some medium. Imagine you were to move at the same speed as the electrons, and in the same direction as them (Think about it like this, the current is a train, and you are driving a car at the same speed as the train.) Would you still see a magnetic field? Why or Why not? 6. I stole this from Serway but here: Why do charged particles from outer space, called cosmic rays, strike Earth more frequently at the poles than at the equator? (Hint: what direction are the magnetic field lines pointing at the poles versus at the equator?)