An Electron Is Traveling East with an Instantaneous Velocity of 3.3

question 35

Multiple Choice

An electron is traveling east with an instantaneous velocity of 3.3 * 10⁵ m/s when it enters a uniform magnetic field of 0.25 T that points X degrees north of east. (Take east as to the right of the paper and north as towards the top of the paper, i.e. both in the plane of the paper.) If the magnitude of the force on the electron is 5.5*10^-15 N, then calculate the angle X and whether the electron moves up out of or down into the plane of the page, or otherwise.

• A) 26° and up out of the page
• B) 65° and down into the page
• C) 26° and down into the page
• D) 65° and up out of the page
• E) 65° and south in the plane of the paper

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