Register to reply

Charging and discharging of capacitors

by thereddevils
Tags: capacitors, charging, discharging
Share this thread:
thereddevils
#1
Mar15-10, 01:52 AM
P: 439
The questions says an isolated conductor has charge Q ...

is isolated the same as uncharged ? If so , how can it have charge Q ?

Also , if an earthed conductor is brought near a positively charged capacitor , some of the negative charges will move to the +ve charged capacitor and vice versa , so would the charge still remain constant ? Or the amount of charge that leave the capacitor equal the amount that came in ?
Phys.Org News Partner Science news on Phys.org
What lit up the universe?
Sheepdogs use just two simple rules to round up large herds of sheep
Animals first flex their muscles
ehild
#2
Mar15-10, 02:39 AM
HW Helper
Thanks
P: 10,607
Isolated means that the conductor is not connected to anything.

A capacitor usually has two plates, with equal and opposite charges. What do you mean on positively charged capacitor?

Charges can move to one body to an other one if there is some conducting contact between the objects.


ehild
thereddevils
#3
Mar15-10, 02:46 AM
P: 439
Quote Quote by ehild View Post
Isolated means that the conductor is not connected to anything.

A capacitor usually has two plates, with equal and opposite charges. What do you mean on positively charged capacitor?

Charges can move to one body to an other one if there is some conducting contact between the objects.


ehild
could it be that the positively charged capacitor have positive charges on both plates ? Then when it is brought near to a negatively charged conductor , the charges will move across each other right ? Then will the amount of charges on the capacitor the same now ?

ehild
#4
Mar15-10, 03:02 AM
HW Helper
Thanks
P: 10,607
Charging and discharging of capacitors

The charges can not jump to one plate of a capacitor onto the other one.


ehild
thereddevils
#5
Mar15-10, 03:59 AM
P: 439
Quote Quote by ehild View Post
The charges can not jump to one plate of a capacitor onto the other one.


ehild
what if it is connected to a battery ? I thought the battery would pump the charges around .
ehild
#6
Mar15-10, 05:59 AM
HW Helper
Thanks
P: 10,607
No, the charges can move only in the wires which connect one pole of the battery to one plate of the capacitor.

ehild
thereddevils
#7
Mar15-10, 07:59 AM
P: 439
Quote Quote by ehild View Post
No, the charges can move only in the wires which connect one pole of the battery to one plate of the capacitor.

ehild
oh , so the charges can only move to the other side of the plate through the battery ?
ehild
#8
Mar15-10, 10:13 AM
HW Helper
Thanks
P: 10,607
Quote Quote by thereddevils View Post
oh , so the charges can only move to the other side of the plate through the battery ?
Yes.


Register to reply

Related Discussions
Charging and Discharging Introductory Physics Homework 5
Charging/discharging capacitor circuit Introductory Physics Homework 0
Charging / Discharging Capacitors In Series Electrical Engineering 14
Charging and Discharging of a Capacitor Electrical Engineering 2
Charging/discharging capacitor Introductory Physics Homework 1