(a) When dust air goes past the metal rods, the dust particles become negatively charged. This is because the dust particles
A Lose electrons
B Lose protons
C Gain electrons
D Gain protons
(b) When the dust air flows past the metal plates, the dust particles settle on the metal plates.
Explain why the dust particles settle on the metal plates.
(c) State what happens to the charge on the dust particles when they settle on the metal plates.
(d) Explain why the charge does not build up on the metal plates.
