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

its velocity decreases

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its velocity increases

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it will turn towards right of its motion

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it will turn towards left of direction of motion

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Solution

The correct option is B its velocity decreases
$F = - e F + e (\to v \times \to B)$
$= - e E$ and $v = v_{0} - \frac{e E}{m} t$

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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 along the direction of the fields with a certain velocity then

The correct option is B its velocity decreasesF=−eF+e(→v×→B)=−eE and v=v0−eEmt

The correct option is B its velocity decreases
$F = - e F + e (\to v \times \to B)$
$= - e E$ and $v = v_{0} - \frac{e E}{m} t$