Electrostatic induction - rod and sphere

  • Thread starter eranium
  • Start date
  • #1
4
0

Homework Statement



Hi all, need a little help on an electrostatic induction problem.

A positively charged metal rod is brought near to a neutral metal sphere. What is the charge of the metal sphere and the rod when the positively charged rod touches the neutral sphere.

Homework Equations



Nil

The Attempt at a Solution



I know that when the positively charged rod is near the sphere, there will be electrostatic induction. There will be charge redistribution on the metal sphere, negative charges will be on the side of the sphere that is closer to the rod and the positive charges will be on the other side of the sphere that is further away from the rod.

I am not sure what will happen when the positively charged rod touches the metal sphere. My guess is the negative charges on the already polarized sphere will flow into the positively charged rod, neutralising the rod and leaving the sphere positively charged.

will appreciate if someone can enlighten me on this. Thanks!
 

Answers and Replies

  • #2
Simon Bridge
Science Advisor
Homework Helper
17,857
1,654
My guess is the negative charges on the already polarized sphere will flow into the positively charged rod, neutralising the rod and leaving the sphere positively charged.
... that was a well reasoned "guess", well done ;)

Induction is just charges being attracted and repelled.
The negative charges that were attracted to the rod will flow onto it - unless there is some reason for them not to.
 

Related Threads on Electrostatic induction - rod and sphere

Replies
8
Views
4K
Replies
4
Views
966
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
5
Views
2K
  • Last Post
Replies
2
Views
735
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
4
Views
7K
  • Last Post
Replies
1
Views
3K
Replies
4
Views
6K
  • Last Post
Replies
3
Views
2K
Top