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=qVB\sin \theta

F=0

-

 

Magnetic field applied parallel to motion of electron exerts no force on it as \Theta =0 and force  = Bevsin \Theta = zero

Electric field opposes motion of electron which carries a negative charge

\therefore   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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