if electric field is applied parallel to the direction of electron beam , the electron will (A) speed up (B)slow down (C) deflect (D)not change its state
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if electric field is applied parallel to the direction of electron beam , the electron will (A) speed up (B)slow down (C) deflect (D)not change its state
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Given:
Electric field is applied parallel to the direction of electron beam.
To find:
Direction of displacement of electron beam?
Calculation:
Force on a moving charge (here electron) is given as :
[tex] \boxed{ \bf\vec{F} = q( \vec{v} \times \vec{B})}[/tex]
[tex] \sf \implies | \vec{F}| = q \times v\times B \times \sin( \theta) [/tex]
[tex] \sf \implies | \vec{F}| = q \times v\times B \times \sin( {0}^{ \circ} ) [/tex]
[tex] \sf \implies | \vec{F}| = q \times v\times B \times 0[/tex]
[tex] \sf \implies | \vec{F}| = 0[/tex]
So, the electron will not get deflected , hence will not change its state (option 4).