I was using adsense on one site and there my CPC was good. it was abt $0.70 but as i put adsense on another site, my old site's CPC suddenly decrease to about $0.10 . I am really worried about it, please help me. I am thinking to remove the adsense from 2nd site which decreased my 1st site earning.
The second site wouldn't effect the first. Do you have a large enough sample of clicks to accurately say that the CPC has dropped? It's more likely that the ads displayed on the page have changed.
yes I am sure, I have proof that my cpc has droped. well , why ads have been changed if my site contents is same as before?
Actually the second WOULD affect the first if the the second had very poor conversion rate on the advertiser's site, leading to smart-pricing which effects the users entire account, not just the site that was poor-performing.
Don't remove the adsense from the second site. The reason is some other different one. May be you get less traffic and reason may be anything. But the reason is not for putting adsense codes on second website.