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  4. A uniform electric field and 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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Q. A uniform electric field and 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

BITSATBITSAT 2013

Solution:

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.