A 565-turn circular-loop coil with a diameter of 16.1 cm is initially aligned so that its plane is perpendicular to the Earth's magnetic field. In 2.70 ms the coil is rotated 90.0? so that its plane is parallel to the Earth's magnetic field. An average emf of 0.154 V is induced in the coil.
What is the value of the Earth's magnetic field?
Answer in units of T