Show all work for a thumbs up$.$ Cell phones can be charged wirelessly with an external charger that creates a magnetic field to induce a voltage in a wire loop inside the phone. The figure below depicts a $0\mathrm{.}58$ cm diameter loop inside a phone. At one instant, the strength of the magnetic field is $0\mathrm{.}35$ T $,$ and then $3\mathrm{.}33s$ later, it has dropped to zero. Calculate the average induced voltage across the ends of the wire. $($Area of a circle $=r^2.)$