An isolated parallel-plate capacitor with air gap has capacitance
PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
An isolated parallel-plate capacitor with air gap d has capacitance C0, charge Q and potential difference V. A conducting slab of thickness d/2 is inserted centrally between the plates so that it remains parallel to them and does not touch either plate. After insertion, the new potential difference between the plates is
(a) 2V
(b) V
(c) 2V
(d) 4V