ELECRTROMAGNETISM: a. A student moves a magnet into a coil and the needles on the ammeter moves to the left. Describe what would happen if she moved the magnet out of the coil.

b. She wants to investigate how the number of turns on the coil affects the size of the current. Describe and explain the graph she could draw using her results.

Uranium has two naturally occurring isotopes. 238u has a natural abundance of 99.3% and 235u has an abundance of 0.7%. it is the rarer 235u that is needed for nuclear reactors. the isotopes are separated by forming uranium hexafluoride uf6, which is a gas, then allowing it to diffuse through a series of porous membranes. 235uf6 has a slightly larger rms speed than 238uf6 and diffuses slightly faster. many repetitions of this procedure gradually separate the two isotopes. what is the ratio of the rms speed of 235uf6 to that of 238uf6? express your answer to five significant figures.