An Electron Moving with a Velocity = 5

question 45

Multiple Choice

An electron moving with a velocity = 5.0 × 10⁷ m/s enters a region of space where perpendicular electric and a magnetic fields are present. The electric field is = - 10⁴ . What magnetic field will allow the electron to go through, undeflected?

• A) = + (2.0 × 10^-4
• B) = - (2.0 × 10^-4
• C) = + (2.0 × 10^-4
• D) =- (2.0 × 10^-4
• E) = + (5.0 × 10^-4

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