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AP Physics 2
12.2 Magnetism and Moving Charges
12.1 Magnetic Fields
AdvancedMCQMathematicalConceptual15.1k
A positive charge entering crossed electric and magnetic fields.
A positive charge entering crossed electric and magnetic fields.
A particle with positive charge \(+q\) is launched horizontally to the right with speed \(v\) into a velocity selector. The selector contains a uniform electric field \(\vec{E}\) directed toward the bottom of the page and a uniform magnetic field \(\vec{B}\) directed into the page. The speed of the particle satisfies \(v > \dfrac{E}{B}\). Which of the following correctly predicts the initial direction of deflection of the particle and describes the change in its kinetic energy immediately after entering the fields?

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