Astronauts on a space station decide to use Earth's magnetic field to generate electric current. Earth's B→ field in this region has a magnitude of 3.0 × 10⁻⁷ T. They have a coil that rotates 90° in 1.2 s. The area inside the coil measures 5000 m².
Estimate the number of loops needed in the coil so that during that 90° turn it produces an average induced emf of about 120 V. Express your answer using two significant figures.