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# The Electric Field on a Floating Proton

EANDM-BRX1WS

A proton is placed in a region with a uniform, vertical electric field, with a magnitude such that the proton is in equilibrium under gravity and the electrostatic force. A proton weighs $1.6\times 10^{-27}$ kg, and has a charge of $1.60\times 10^{-19}$ C.

What is the magnitude of the electric field?

A

$1.0\times10^{-7}$ N/C

B

$1.0\times10^{-6}$ N/C

C

$3.3\times10^{-7}$ N/C

D

$1.0\times10^{-2}$ N/C