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此套題僅?p II含有簡答題,
共計(jì)時(shí)45分鐘,共35題
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1)A positive point charge is initially at rest close to a bar magnet that is also at rest. The charge will
Questions 11-12

A uniform magnetic field B directed downward parallel to the plane of the page exists in the shaded region shown above. An electron can enter the field from different directions.
11)Suppose that the electron is moving straight down in the same direction as B when it enters the region of the magnetic field. What is the direction of the magnetic force, if any, on the electron when it first enters the field region?
12)Suppose that electron is moving perpendicularly into the plane of the page when it enters the region of the magnetic field. What is the direction of the magnetic force, if any, on the electron when it first enters the field region?
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