1.

Pick out the dimensional formula of emf from the following.(a) [M^1L^2T^3A^1](b) [ML^3T^3A^1](c) [M^2L^2T^1A^-1](d) [ML^2T^-3A^-1]I had been asked this question in final exam.Enquiry is from Current Electricity in section Current Electricity of Physics – Class 12

Answer»

The correct answer is (d) [ML^2T^-3A^-1]

The best I can explain: Electromotive FORCE (emf) is defined as the POTENTIAL difference between the TWO terminals of a cell in an OPEN circuit. The SI unit of emf is \(\frac {joule}{coulomb}\) or volt. So, its dimensional formula is [ML^2T^-3A^-1].



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