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Describe the working principle of a permanent magnet moving-coil (PMMC) instrument.
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A battery of emf E and internal resistance r sends a current, I1 , I2 when connected to an external resistance of R1 , R2 respectively. Find the emf. and internal resistance of the battery.
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Explain with the help of a circuit diagram, how the value of an unknown resistance can be determined using a Wheatstone bridge?
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Why do we prefer a potentiometer to measure the emf of a cell rather than a voltmeter?
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