An electron is launched with velocity in a uniform magnetic field .The angle $\theta$0between and is between 0 and 90^o.As a result, the electron follows a helix, its velocity vector returning to its initial value in a time interval of: A)2$\pi$m/eB B)2$\pi$mv/eB C)2$\pi$mv sin$\theta$/eB D)2$\pi$mv cos$\theta$/eB E)none of these

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The Answer of An electron is launched with velocity in a uniform magnetic field .The angle $\theta$0between and is between 0 and 90^o.As a result, the electron follows a helix, its velocity vector returning to its initial value in a time interval of: A)2$\pi$m/eB B)2$\pi$mv/eB C)2$\pi$mv sin$\theta$/eB D)2$\pi$mv cos$\theta$/eB E)none of these

An Electron Is Launched with Velocity in a Uniform θ\thetaθ

An Electron Is Launched with Velocity in a Uniform $\theta$