You want to use the idea of electromagnetic induction to make the bulb in your small flashlight glow; it glows when the potential difference across it is 1.5 Volt. You have a bar magnet and a coil with 100 turns, each with area 3.1 ×104 m2. The magnitude of the B field at the front of the bar magnet's north pole is 5.0 × 102 T and reaches 0 T when it is about 4 centimeter away from the pole. Find with what speed should you move the magnet to make the bulb light?