A) an ellipse
B) a straight line
C) a circle
D) a helical.
Correct Answer: D
Solution :
When a charged particle enters a magnetic field, the particle experiences a Lorentz force given by \[\overrightarrow{F}=q(\overrightarrow{v}\times \overrightarrow{B}),\]which act in a direction perpendicular to both \[\overrightarrow{v}\]and \[\overrightarrow{B}\]. Now since the initial velocity of the particle makes an angle \[{{45}^{o}}\] with the magnetic field, it will be having a velocity component parallel to \[\overrightarrow{B}\] and another component perpendicular to \[\overrightarrow{B}\]. The parallel component of velocity is going to experience no force, So it will remain the same but as the perpendicular component will experience a constant force in the normal plane, hence the particle will finally move in a helical path.You need to login to perform this action.
You will be redirected in
3 sec