PHYSICS · Multi-part · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
Two identical, extensive conducting plates are held parallel to each other at a fixed separation d and a potential difference V. Neglect edge effects.
(a) Starting from the definition of electric potential difference, derive an expression for the magnitude of the electric field between the plates in terms of V and d.
(b) Using the result of part (a), state how the electric field changes if the potential difference is doubled while d remains the same.
(c) The field strength between the plates is measured to be 3.0×104V m−1. Express this value in (i) kV/m and (ii) V/cm.
(d) A student claims that 1V cm−1 is equal to 100V m−1. Examine the claim and justify whether it is correct or incorrect with proper calculation.