A 500 turn circular-loop coil 16.0 cm in diameter is initially aligned so that its axis is parallel to the Earth's magnetic field. In 2.89 ms, the coil is flipped so that its axis is perpendicular to the Earth's magnetic field. If an average voltage of 0.170 V is thereby induced in the coil, what is the value of the Earth's magnetic field at that location? BEarth = 1 µT