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Which is the best for showing percentages of different types of cars sold(gas hybrid , electric , other ) in the united states ?

Abar magnet cut in half will form a total ofpoles.a)fourb)eightc)two

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?