I have a problem that I can not understand what I am doing wrong. A rocket moves at 1.0*18^6 m/s. Inside is an E Field (coming out of the page of the book) that is 2.0*10^6 V/m. There is also a B Field in the rocket pointing up that is -1.0 T. What is the E Field observed by someone on Earth. (The rocket is sooming past Earth.) I used E = E - V X B = E - V*B (V and B are perpindicular) = sqrt((1.0*10^6)^2 + (2.0*10^6)^2) However this does not yield the correct answer. Any help is appreciated. If anyone is working the numbers I got 2.24*10^6.