The question i am stuck on and am unable to find anything in my notes about (although i cant find my notes from tuesday however we seem to have covered the topic on friday and maybe just not finished it off in time) is ....(adsbygoogle = window.adsbygoogle || []).push({});

Two isolated spherical conductors one with radius R and one with radius 3R, each carrying a positive charge Qo. The spheres are brought together and then seperated again, find the charge on each sphere.

from what i can think they would act as one surface and the charge would evenly distribute over the whole surface, then i would work out the surface area of each sphere seperately and take a ration and then spread the charge of 2Qo over each sphere and give my answer in terms of Qo?

then a little more difficult

if a small charged sphere is brought into contact with another identical sphere which has no charge then seperated by 10cm the force between them is 9x10^-3N what was the original charge on the first sphere

it relates to my answer from before, if i am right with what i said above, would i work out the difference between the 2 and work out the respective charges, then add them together to get the charge originally on the first?

any and all help greately appreciated, thanks

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# Charged conducting spheres

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