Apositive charge q moves with velocity v in the z direction through a magnetic field whose vector is in the x direction. if the charge is negative and it moves in the negative-z direction, the force on the charge will be:

a) reversed

b) unchanged

c) zero

d) increased

Madison lives near the ocean. she’s formed a hypothesis that increased concentrations of salt in the air speeds the corrosion of certain metals. if madison plans to test this hypothesis, she will have to deal with the following variables in her experiment: dependent variable: independent variable: one possible confounding variable: