O-LevelPhysicsElectricity5054/11 · Oct/Nov 2019 · Q381 Mark
A student suggests four conditions for the production of a continuous flow of electrons from a metal filament. 1 The filament is hot. 2 A high-pressure gas is present. 3 A high positive electrical potential is present. 4 A strong magnetic field is present. Which of the four conditions are needed?
A1 and 4
B2 and 3
C1 and 3
D2 and 4
✓ Correct answer
C: 1 and 3
Practise more questions on this topic
Oracle Prep sorts past-paper questions by topic, so you can drill Electricity and see which topics are most likely to come up next.
Sign up free →