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