An Electron and a Proton Both Each Travel with Equal

question 16

Multiple Choice

An electron and a proton both each travel with equal speeds around circular orbits in the same uniform magnetic field, as shown in the diagram (not to scale) . The field is into the page on the diagram. Because the electron is less massive than the proton and because the electron is negatively charged and the proton is positively charged:

• A) the electron travels clockwise around the smaller circle and the proton travels counterclockwise around the larger circle.
• B) the electron travels counterclockwise around the smaller circle and the proton travels clockwise around the larger circle
• C) the electron travels clockwise around the larger circle and the proton travels counterclockwise around the smaller circle
• D) the electron travels counterclockwise around the larger circle and the proton travels clockwise around the smaller circle
• E) the electron travels counterclockwise around the smaller circle and the proton travels counterclockwise around the larger circle

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