A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected in the region such that its velocity is pointed along the direction of fields, then the electron:
Will turn towards left of direction of motion
Will turn towards right of direction of motion
Speed will decrease
Speed will increase
As we learnt in
Magnetic force If θ = 0° or θ = 180° -
F=0
-
Magnetic field applied parallel to motion of electron exerts no force on it as and force = Bevsin
= zero
Electric field opposes motion of electron which carries a negative charge
velocity of electron decreases.