7 m long steel beam is accidentally dropped by a construction crane from a height of 6. The horizontal component of the Earth's magnetic field over...

A 18.7 m long steel beam is accidentally dropped by a construction crane from a height of 6.77 m. The horizontal component of the Earth's magnetic field over the region is 8.37 µT. The acceleration of gravity is 9.8 m/s 2 . What is the induced emf in the beam just before impact with the Earth, assuming its long dimension remains in a horizontal plane, oriented perpendicularly to the horizontal component of the Earth's magnetic field? Answer in units of mV.