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The atmospheric layer reflecting radio waves is called
Center of buoyancy always-
Two identical metal balls with charges + 2Q and – Q are separated by some distance, and exert a force F on each other. They are joined by a conducting wire, which is then removed. The force between them will now be_________?
The characteristic of sound which distinguishes a female voice from a male voice is called
In superconductors, the energy gap is due to