Questions and answers normally not answered by students in physics

Name the Physical quantities to be kept constant for Ohm’s law to be true.  State the Principle of a potentiometer. (The students say that potential drop is proportional to length but the constant quantities are not mentioned) How can we increase the sensitivity of a potentiometer?  Define figure of merit of a galvanometer. Which has more resistance – a galvanometer or a milliammeter?  How...

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