An Electron Passes Through a Region Where There Is an Electric

question 55

Multiple Choice

An electron passes through a region where there is an electric field E = 4.0 × 10⁵ V/m and a magnetic field B = 0.090 T. The directions of the electric field, the magnetic field, and the electron velocity are mutually perpendicular. If the electron is not deflected from its straight-line path through these fields, its speed must be

• A) 3.6 × 10⁴ m/s.
• B) 5.0 × 10⁵ m/s.
• C) 2.2 × 10^-7 m/s.
• D) 1.2 × 10⁴ m/s.
• E) 4.4 × 10⁶ m/s.

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