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

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Correct answer: A. Speed will decrease

Given condition is shown in figure A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an

A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an

Force due to magnetic field is given by

F_m=q v B \sin \theta

Here

\theta=0 \Rightarrow F_m=0

Force due to electric field is

\vec{F}_e=q \vec{E}

Here,

\vec{F}_e=-e \vec{E}

\therefore

Force due to electric field will be opposite to the direction of motion. Hence its speed will decrease.

A uniform electric field and a uniform magnetic field are acting...

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