An Electron Moves Through a Region of Crossed Electric and Magnetic

question 40

Multiple Choice

An electron moves through a region of crossed electric and magnetic fields.The electric field E = 3381 V/m and is directed straight down.The magnetic field B = 0.77 T and is directed to the left.For what velocity v of the electron into the paper will the electric force exactly cancel the magnetic force?

• A) 4400 m/s
• B) 2600 m/s
• C) 4200 m/s
• D) 5200 m/s
• E) ​7000 m/s

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