Velocity Selector: a Uniform Magnetic Field of Magnitude 0

question 13

Multiple Choice

Velocity selector: A uniform magnetic field of magnitude 0.80 T in the negative z-direction is present in a region of space, as shown in the figure. A uniform electric field is also present. An electron that is projected with an initial velocity in the positive x-direction passes through the region without deflection. What is the electric field vector in the region?

• A) - 73 kV/m
• B) + 73 kV/m
• C) + 110 kV/m
• D) + 110 kV/m
• E) - 110 kV/m

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