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- I have a doubt, kindly clarify. A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected along the direction of the fields with a certain velocity then
A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected along the direction of the fields with a certain velocity then
- Option 1)
it will turn towards right of direction of motion
- Option 2)
it will turn towards left of direction of motion
- Option 3)
its velocity will decrease
- Option 4)
its velocity will increase
Answers (1)
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.
Option 1)
it will turn towards right of direction of motion
Incorrect option
Option 2)
it will turn towards left of direction of motion
Incorrect option
Option 3)
its velocity will decrease
Correct option
Option 4)
its velocity will increase
Incorrect option
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