Go Back   Physics Help Forum > College/University Physics Help > Advanced Electricity and Magnetism

Advanced Electricity and Magnetism Advanced Electricity and Magnetism Physics Help Forum

LinkBack Thread Tools Display Modes
Old Jul 20th 2018, 12:13 AM   #1
Junior Member
Join Date: Jul 2018
Posts: 1
Post Electric field strength between two rings:

Hi to everyone! I'm here to ask how could you resolve this problem about electric fields: two charges q1= 1.88*10^-8 and q2=-7.54*10^-8 are evenly distributed on two rings with the same radius R=30 cm, positioned above two parallel planes, far each other d=3mm. We have to calculate the strength that the first ring applies on the second ring (NOT IN THE CENTRE, BUT IN EACH MICRO-PART OF THE RING). Someone suggested me to approximate the rings with two wires because d<<R and that actually works. But I wanna have a formula which is always effective foe the calculus, not only in this case. Someone else suggested me to consider the the variable distance with the polar coordinates: x1=Rcost, y1=Rsint and z1=0 for the first ring and x2=Rcosp, y2=Rsinp and z=d , then find the result of:

K*q1q2* Double Integral from 0 to 2Pi of 1/((R^2(cost-cosp)^2)+(R^2(sint-sinp)^2)+d^2)) But the result of integral is 0 and it does not make sense. SOME CAN HELP ME!!! Thanks very much to everyone!!
Fabry97 is offline   Reply With Quote
Old Jul 20th 2018, 05:43 PM   #2
Physics Team
Join Date: Apr 2009
Location: Boston's North Shore
Posts: 1,551
Forum rules require you to show us an attempt by you first or why you're unable to start.
Pmb is online now   Reply With Quote

  Physics Help Forum > College/University Physics Help > Advanced Electricity and Magnetism

electric, field, rings, strength

Thread Tools
Display Modes

Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
Electric field strength Clyner82 Electricity and Magnetism 0 Apr 30th 2016 05:23 PM
Electric Field Strength Problem TomM Electricity and Magnetism 1 Apr 18th 2011 04:52 PM
Show that in an electric field strength, F/G is equal to V/D !? Yehia Electricity and Magnetism 1 Mar 2nd 2010 10:05 AM
Electric Field Strength and Two Voltage Probes machinegunrosie Electricity and Magnetism 2 Jan 27th 2010 01:43 PM
Electric Field Strength mikewhant Electricity and Magnetism 1 Jan 15th 2010 07:39 PM

Facebook Twitter Google+ RSS Feed