What speed would a +1.00 c particle need to have to travel in a straight line through a 5.00 t magnetic field that is directed into the screen and a 2.00 v/m electric field that is directed from top to bottom?
40.0 m/s
4.00 m/s
0.400 m/s
0.0400 m/s

i will report you if you give a cruddy answer - explain!

there are 2 forces acting on the particle: magnetic n electric force

the 2 forces must be equal 4 it to travel in a straight line

as it has +1C charge, q, the charge is dropped in the following:

magnetic force = qv x B where v is velocity n B is magnetic field;

x represents cross-product which in this case of 90-deg. is same as multiply

magnet force = v*5

electric force = qE where E is electric field

= 2

as magnet force = electric force

v*5 = 2

v=2/5=0.400m/s

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the answer is to check all of them! they all apply well at least i think so!