Electrostatics - Calculate the repelling force of a charge q

[10001]

Homework Statement

It is given a hemisperical shell charged uniformally with a density charge equal to s.
Calculate the force by which it repels an electric charge q which is put in its center(in the center of the largest diameter).

 

[tiny-tim]

Welcome to PF!

Homework Statement

It is given a hemisperical shell charged uniformally with a density charge equal to s.
Calculate the force by which it repels an electric charge q which is put in its center(in the center of the largest diameter).

HI 10001! Welcome to PF!

The rule here is that you show us what you've tried, and where you're stuck … then we'll know how to help you!

 

[10001]

I just cant do it

 

[tiny-tim]

Calculate the force from a little bit of the hemisphere, and then add all the forces from all the little bits.

 

[10001]

I know that
Easy to say

Now please could you give me a hand.I have my physics exam approaching...

 

[tiny-tim]

Now please could you give me a hand.

No … try it yourself!

This forum is to help you, not to do your work for you!

 

[10001]

I did it

 

[tiny-tim]

Woohoo! ​