On a humid day the quality of photocopies often degrades because less toner adheres…
PHYSICS · Single correct · CBSE · Physics · Electrostatic Potential and Capacitance · Electrostatic Potential and Capacitance
Problem
On a humid day the quality of photocopies often degrades because less toner adheres to the photoconductor drum. Which of the following gives the most appropriate reason for this observation?
(a) Humidity decreases the resistivity of the air around the drum, so the toner particles discharge in transit and do not reach the surface.
(b) Water droplets in moist air polarise strongly and pull the toner towards themselves, leaving little toner for the drum.
(c) Moisture absorbs much of the scanning lamp light, so the drum is insufficiently exposed and fails to attract toner.
(d) Humidity increases the surface conductivity of the photoconductor, allowing its residual charge to leak away; therefore very little toner is electrostatically attracted.