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

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Speed will increase

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Will turn towards left of direction of motion

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Will turn towards right of direction of motion

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Solution

The correct option is A Speed will decrease
When $E$ , $V$ and $B$ are along same direction, then, magnetic force experienced by electron is zero while electric force is acting opposite to velocity of an electron, So the velocity of the electron will decrease.

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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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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

The correct option is A Speed will decreaseWhen E ,V and B are along same direction, then, magnetic force experienced by electron is zero while electric force is acting opposite to velocity of an electron, So the velocity of the electron will decrease.

The correct option is A Speed will decrease
When $E$ , $V$ and $B$ are along same direction, then, magnetic force experienced by electron is zero while electric force is acting opposite to velocity of an electron, So the velocity of the electron will decrease.