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Oven heats up but not to temp? Where do the laws of physics come from? Where does mathematics come from? There r two charges +4Q and +Q and separated by a distance d find where should a third charge be placed so that net force on it is zero? If a differentiable function y(x) satisfies y'=|x| , y(1)=2 , then y(x)= ? Tretinoin question?