1. You are looking into a current carrying solenoid and notice that the compass needle indicates that you are at the south end of the magnetic field. What is the direction of the current in the coil and how do you know?
Would it be clockwise because current moves towards the south pole
2. the electromagnet in an MRI has a magnetic field of 2.5 T. If there are 100 A of current running through the magnet, how many turns are there in a 1.8 m length?
Would the answer be 0.28? I used the formula B=uI/(2)(pi)(r).