PHYS 1302W Lecture Notes - Lecture 1: Electromagnet
Document Summary
A loop of wire 10. 0 cm x 12. 0 cm lies in a perpendicular magnetic field that is decreasing at 0. 20 t/s. Choose a to be out of the plane. The direction given to a defined the positive current (or emf) direction. For a out of plane, positive current would be counter clockwise by the right hand rule. The negative current implies that it is clockwise. A coil having 500 turns and radius 4. 00 cm lies between the poles of an electromagnet as shown. A loop having n coils and area a rotates at angular speed w in a constant magnetic field. Using a split ring commutator, this can be rectified. Another way to determine the direction of the induced emf in faraday"s law. The direction of any magnetic induction effect us such as to oppose the cause of that effect. Induced magnetic field points right (opposes increases to the left). Induced magnetic field points left (opposes increases to the right).
