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"Let the random variable X represent the number of heads obtained when 3 fair coins are flipped. Calculate the mean, the variance, the standard deviation, and the coefficient of variation of X." My biology professor refuses to help me with any homework problems, and I can't afford tutoring. I...

A long wire carrying 5 A current perpendicular to the xy-plane intersects the x-axis at x = -2cm. A second, parallel wire carrying a 3 A current intersects the x-axis at x = +2cm. At what point or points on the x-axis is the magnetic field equal to 0 if a) the two currents are in the same...