ON21 P41 Q6 Disconnected Capacitor Separation Change | Oct/Nov 2021 | CAIE A Level 9702 Physics

9702/41/O/N/21: (a) A capacitor consists of two parallel metal plates, separated by air, at a variable distance x apart, as shown in Fig. 6.1. The capacitance C is inversely proportional to x. The capacitor is charged by a supply so that there is a potential difference (p.d.) V between the plates. State expressions, in terms of C and V, for the charge Q on one of the plates and for the energy E stored in the capacitor. #9702w21p41 #A2capacitorEnergyP4 #Lv3 (b) The charged capacitor in (a) is now disconnected from the supply. The plates of the capacitor are initially separated by distance L. They are then moved closer together by a distance D, as shown in Fig. 6.2. State expressions, in terms of C, V, L and D, for: (i) the new capacitance CN (ii) the new charge QN on one of the plates (iii) the new p.d. VN between the plates. (c) Explain whether reducing the separation of the plates in (b) results in an increase or decrease in the energy stored in the capacitor. #A2capacitors Playlist:    • Ch19 Capacitance | CAIE 9702 A2 Physics   ON21 Paper Discussion Playlist    • 9702 ON21 Papers CAIE Physics   Instagram Pocket Guide (  / etphysics  ) More Resources (https://9702-physics.blogspot.com/) Support us! (  / etphysics  ) Tuition/Tutoring inquiries: Email: [email protected] Whatsapp: https://wa.me/60126679171 Recorded at MCKL #CambridgeALevelPhysics 9702_w21_qp41