253-hwk-28a - HPHY 253 Homework 28a Capacitance and...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
HPHY 253 Homework 28a Capacitance and Resistance Dr. A. E. Bak Name 26 : 4 . Consider Earth and a cloud layer 800 m above it as the ±plates²of a capacitor. Calculate the capacitance of the Earth-cloud layer system, assuming that the cloud layer has an area of 1 : 00 km 2 and that the air between the cloud and ground is pure and dry. As time goes on, charge builds up on both the cloud and ground until a uniform electric ³eld of magnitude 3 : 00 10 6 N= C throughout the space between them, makes the air break down and conduct electricity as a lightning bolt. What is the maximum charge that the cloud can hold? 26 : 12 . Two capacitances C 1 = 5 : 00 and C 2 = 12 : 0 are connected in parallel, and the resulting combination is connected to a 9 : 00 - V battery. (a) Find the equivalent capacitance of the combination. (b) Find the potential di/erence across each capacitor. (c) Find the amount of charge stored on each capacitor.
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 05/01/2011 for the course HPHY 253 taught by Professor Bak during the Spring '09 term at Morehouse.

Ask a homework question - tutors are online