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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.


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


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


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


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


Doubling both the Magnetic and Electric Fields

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