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AP® Physics C: E & M

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Moderate

$E$ and $g$ Fields

APPHEM-YLURYU

The diagram shows a proton (charge q, mass m) and an alpha particle (charge 2q, mass 4m) situated in the same downward-pointing uniform field. If the field is gravitational, then both particles have the same acceleration.

What happens if the field is an electric field?

A

Both particles still have the same acceleration because electric fields are analogous to gravitational fields.

B

The alpha particle has greater acceleration because it has greater charge.

C

The alpha particle has greater acceleration because it has greater mass-to-charge ratio.

D

The proton has a greater acceleration because it has less mass.

E

The proton has greater acceleration because it has a greater charge-to-mass ratio.