What is the magnetic force on a proton that is moving at 3.8 x 10^7 m/s up through a magnetic field that is 0.72 T and pointing toward you?

The force is F = B q v = 0.72 x 1.6x 10^-19 x 3.8 x 10 ^7 = N
The force will be at 90 degrees to both the motion of the proton and the magnetic field.

Julia would be observing a. static electricity was caused by her sweater rubbing against her shirt and transferring electrons. she didn't touch anything metal, so that would cancel out b.she most likely didn't rub her sweater against her hair either, so that cancels out c.she also didn't scoot across the carpet while trying to take her sweater off, that cancels out d.so that leaves a.a. is correct.