Electromagnetic Induction – Practice
1) A square coil with 100 turns, and sides of 15cm moves from a region with no magnetic field into a magnetic field of 5T over a time interval of 0.25s. Calculate the magnitude of the induced emf:
2) A coil with an area of 0.0025m2 that is initially not in a magnetic field is exposed to a magnetic field of 0.4T over a period of 0.2s. If the magnitude of the induced emf is 0.5V, how many turns must be on the coil?
3) Determine the direction of the induced current in the examples below:
4) A bar magnet is moved toward a coil as shown below. Indicate on the diagram the direction of the induced current in the coil:
1) 45 V
3a) anticlockwise b) anticlockwise