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AP® Physics C: E & M

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Moderate

Maintaining Zero Net Force in Crossed Fields

APPHEM-NMDU5F

A particle of charge $q$ and mass $m$ is moving through a region of space at right angles to an electric field and a magnetic field, where the crossed magnetic and electric fields produce a zero net force on the charge.

If the speed of the charge is doubled, which of the following changes will again produce a zero net force on the charge?

Select ALL that apply.

A

Reducing the Electric field to $\mathit{\frac{1}{2}E}$

B

Increasing the Electric field to $\mathit{2E}$

C

Reducing the Magnetic field to $\mathit{\frac{1}{2}B}$

D

Increasing the Magnetic field to $\mathit{2B}$

E

Doubling both the Magnetic and Electric Fields