According to my knowledge rating should increase when i solve a problem reshared by best of electricity and magnetism but I guess it didn't. I had solved 'rotating rod in a magnetic field before it was reshared by the best of electricity and magnetism but still my rating didn't increase after it was reshared.
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Maybe ratings increase when the problem has already been reshared by the 'Best ofs' and then you solve it......I solved 1 or 2 Algebra problems before they were reshared by Best of Algebra and the rating didn't increase after it was reshared