3. Watch carefully the brightness of the light from the bulb connected to the coil and the reading on the voltmeter hooked across the bulb on the top left side. At this point you read zero voltage and see no light. Now fully insert the magnet, leave it inside for a few seconds, may be for 10-20 seconds and then pull the magnet out. When you insert and pull out the magnet consider three speeds: slow, medium, and fast. As much as possible, try to keep the center of the magnet coincides with the center of the coil. Try to do this as many as possible such that you are confident to answer the following questions. (a) How many field lines passes through the coil when the magnet is fully inserted