You have a self-charging battery in your flashlight. The battery is connected to a coil with 100 turns, each an area of 5 x 104 m?. There is a bar magnet sliding through the coil, which can change the field from 0 T to 0.08 T when it moves 4 cm into or out of the coil. How fast do you need to shake the magnet to induce an EMF of 1.5 V and charge the battery? V= m/is