Radiology Tech Physics Practice Test

Which particle has no electric charge?

Neutron Proton Electron Positron

Correct Answer:

Neutron

Explanation:

Electric charge is the property that determines how a particle responds to electric and magnetic fields. The neutron has no net electric charge, so it doesn’t experience electric forces like charged particles do. Its quark composition is two down quarks and one up quark (udd), whose charges add to zero (-1/3 -1/3 + 2/3 = 0). In contrast, a proton is positively charged (uud sums to +1), an electron is negatively charged (-1), and a positron is the positively charged antiparticle of the electron (+1). So the particle with no electric charge is the neutron.

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