Physics problem? HELP!?

An electron moving with a velocity v⃗ = 5.0 × 107 m/s i^ enters a region of space where perpendicular electric and a magnetic fields are present. The electric field is E⃗ = 104 V/mj^. What magnetic field will allow the electron to go through the region without being deflected? A) B⃗ = +2.0 × 10-4 T j^ B) B⃗... show more An electron moving with a velocity v⃗ = 5.0 × 107 m/s i^ enters a region of space where perpendicular electric and a magnetic fields are present. The electric field is E⃗ = 104 V/mj^. What magnetic field will allow the electron to go through the region without being deflected?


A) B⃗ = +2.0 × 10-4 T j^
B) B⃗ = +2.0 × 10-4 T k^
C) B⃗ = -2.0 × 10-4 T k^
D) B⃗ = -2.0 × 10-4 T j^
E) B⃗ = +5.0 × 10-4 T k^

Thanks!!:)
2 answers 2