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  4. A uniform electric field and a uniform magnetic field exist in a region in the same direction. An electron is projected with a velocity pointed in the same direction. Then the electron will:

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Q. A uniform electric field and a uniform magnetic field exist in a region in the same direction. An electron is projected with a velocity pointed in the same direction. Then the electron will:

NTA AbhyasNTA Abhyas 2022

Solution:

Force on a charged particle in the electromagnetic field, $\overset{ \rightarrow }{F}=q\left(\overset{ \rightarrow }{v} \times \overset{ \rightarrow }{B}\right)+q\overset{ \rightarrow }{E}$
As the electron is moving parallel to both the fields, so magnetic force does not affect the electron's motion. But electric force $\left(\right.qE\left.\right)$ acts opposite to the motion of the electron. Hence, the electron will not be deflected, but its speed will decrease.