AIPMT PRELIMS 2009 Physics Galvanometer to Ammeter Conversion MCQ Question
A galvanometer having a coil resistance of 60 Ω shows full scale deflection when a current of 1.0 amp passes through it. It can be converted into an ammeter to read currents up to 5.0 amp by:
putting in series a resistance of 15 Ω
putting in series a resistance of 240 Ω
putting in parallel a resistance of 15 Ω
putting in parallel a resistance of 240 Ω
Correct Answer
Detailed Explanation
To convert the galvanometer to an ammeter, a shunt resistance is used. The shunt resistance is calculated using the formula . For the given values, , so a 15 Ω resistor is put in parallel.
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