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  4. An ionized gas contains both positive and negative ions. If it is subjected simultaneously to an electric field along the +x direction and a magnetic field along the +z direction, then

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Q. An ionized gas contains both positive and negative ions. If it is subjected simultaneously to an electric field along the $+x$ direction and a magnetic field along the $+z$ direction, then

NTA AbhyasNTA Abhyas 2022

Solution:

As electric field will accelerate +ve charge along +ve x- axis and -ve charge along -ve x axis from $\overset{ \rightarrow }{\text{F}} = \text{q} \left(\overset{ \rightarrow }{\text{v}} \times \overset{ \rightarrow }{\text{B}}\right)$ direction of $q\left(\right. \overset{ \rightarrow }{V} \times ​ \overset{ \rightarrow }{B} \left.\right)$ will be same for both of them i.e. $-vey$ direction so both will deflect towards $-vey$ direction.