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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:
A
will turn towards right of direction of motion
B
will turn towards left of direction of motion
C
speed will decrease
D
speed will increase
Detailed Solution
Since the electron's velocity is along the direction of $\vec B$, the magnetic force ($q\vec v\times\vec B$) on it is zero. The electric force on the (negatively charged) electron, moving along the direction of $\vec E$, decelerates it, so its speed will decrease.