A uniform electric field and a uniform magnetic field are acting along the same direction in a certain…
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
speed will decrease
speed will increase
will turn towards left of direction of motion
will turn towards right of direction a motion
Solution
Field $B$ not applied only force. Field $E$ will apply a force opposite to velocity of the electron hence, speed will decreases.