A circular loop of wire of radius R is perpendicular to a magnetic field whose magnitude as a function of time t is given by the equation , where b and c are positive, nonzero constants. What is the magnitude of the emf induced in the loop as a function of time t

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?