Physics A-Level
Velocity selection
What Velocity selection means in Physics A-Level, as defined for OCR.
Definition of Velocity selection
Check what you remember
Read the wording for your board, then hide it and explain Velocity selection in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: OCR
Only particles with speed v = E/B travel undeflected, while slower or faster particles are deflected one way or the other.
Topics that use Velocity selection
- Motion of charged particles (OCR A-Level)
Related terms
- Centripetal force
- Constant speed under a perpendicular force
- Independence of selected speed from charge and mass
- Crossed electric and magnetic fields
- Force balance on a moving charge
- Radius of a charged particle orbit
Using Velocity selection in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
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