Once you have carried out your experiment and have some results, you should A. make a new hypothesis that fits your results
B. keep your results only if they support your hypothesis
C. design a new experiment to test your results
D. analyze your results and draw a conclusion

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?