Uniform electric and magnetic fields are directed along X-direction. An electron is projected in X-direction with a velocity $v$ , then

magnitude of velocity of electron will increase

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magnitude of velocity of electron will decrease

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electron will turn towards right

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electron will turn towards left

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Solution

The correct option is A magnitude of velocity of electron will increase
Since the charge particle is moving along the magnetic field direction hence the magnetic force acting $F = B q v sin θ$ is zero because $θ$ is zero but the electron will experience an electric force $F = q E$ opposite to field. Hence its velocity will be increased.

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A uniform magnetic field and a uniform electric field are produced pointed in the same direction. an electron is projected with its velocity in the same direction

(A) the electron will turn to its right

(B) the electron will turn to its left

D) the electrons velocity will decrease in magnitude

Ans given is option D

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Uniform electric and magnetic fields are directed along X-direction. An electron is projected in X-direction with a velocity v, then

Uniform electric and magnetic fields are directed along X-direction. An electron is projected in X-direction with a velocity $v$ , then