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(B) Initially,the charged particle moves along the magnetic field $B$,so the magnetic force is zero.When a uniform electric field $E$ is applied perpe

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helix

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(B) Initially,the charged particle moves along the magnetic field $B$,so the magnetic force is zero.When a uniform electric field $E$ is applied perpendicular to $B$,the particle experiences an electric force $F = qE$ in the direction of $E$.This force accelerates the particle,giving it a velocity component perpendicular to $B$.As the particle now has velocity components both parallel and perpendicular to the magnetic field $B$,it follows a helical path.Specifically,in the presence of crossed electric and magnetic fields,the particle undergoes cycloidal motion if the initial velocity is zero,but with an initial velocity along $B$,the trajectory is a helix.

$A$ charged particle moves with some initial velocity along the direction of an external magnetic field $B$. Now,if we apply a uniform electric field $E$ perpendicular to the magnetic field,then the trajectory of the charged particle will be

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