Ametal blade (length = 80 cm) spins at a constant rate of 10 radians/s about a pivot at one end. a uniform magnetic field of 2.0 mt is directed at an angle of 30° with the plane of the rotation. what is the magnitude of the potential difference between the two ends of the blade?

Amichelson interferometer operating at a 600 nm wavelength has a 3.02-cm-long glass cell in one arm. to begin, the air is pumped out of the cell and mirror m2 is adjusted to produce a bright spot at the center of the interference pattern. then a valve is opened and air is slowly admitted into the cell. the index of refraction of air at 1.00 atm pressure is 1.00028.how many bright-dark-bright fringe shifts are observed as the cell fills with air?