Answer :
The magnetic force on the electron 4.48×10⁻¹⁴ N
we are provided with the velocity which is (4e5, 0, 0) and the magnetic field which is (0, 0.7, 0) .the Lorentz equation a charged molecule of charge q moving with a speed v will encounter a force ,
F = q × ( E + v × B ) where E is the electric field and B is the magnetic field and q is the charge of the particle. The electron is moving in the positive x direction. The magnetic field is coordinated within the positive y direction from the right-hand palm rule we see that the magnetic force acting on an electron in the + z direction.
so the magnetic forc will be :
F=qvB
= 1.6×10⁻¹⁹*4×10⁵*0.7
= 4.48×10⁻¹⁴ N
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