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

question 3

Multiple Choice

An electron is launched with velocity in a uniform magnetic field .The angle $\theta$ between 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)2πm/eB
• B)2πmv/eB
• C)2πmv sin\(\theta\)/eB
• D)2πmv cos\(\theta\)/eB
• E)none of these

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