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Q.

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:

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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

answer is C.

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Detailed Solution

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Since velocity and magnetic field are in same direction, no magnetic force will act on the electron. 

Due to negative charge, the direction of electric force will oppose the motion of electron. Thus, speed will decrease.

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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: