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  4. 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 :

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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 along the direction of the fields with a certain velocity, then :

AIEEEAIEEE 2005Moving Charges and Magnetism

Solution:

When $\overrightarrow{E}$, $\overrightarrow{V}$ and $\overrightarrow{B}$ are all along same direction, then magnetic force experienced by electron is zero while electric force is acting opposite to velocity of electron, so velocity of electron will decrease.