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Q. Compare the emf and the potential difference. Comparison of emf and potential difference
1. The difference of potentials among the two terminals of a cell in an open circuit is called the electromotive force (emf) of a cell. The difference in potentials among any two points in a closed circuit is called potential difference.
2. The emf is independent of exterior resistance of the circuit whereas potential difference is proportional to the resistance between any two points.
Visible Radiation (Waves): Visible waves have a wavelength range among 400 and 700 nanometre.
determine the neutral point in a system of two unlike charges seperated by a distance
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