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Which one of the two , an ammeter or a milliammeter, has a higher resistance and why? |
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Answer» Solution :To convert a GALVANOMETER into an ammeter of RANGE I we JOIN a shunt resistance `r_s` given by `r_s = (I_g)/(I - I_g) cdot R_G` and then net resistance of ammeter is `(r_s . R_G)/(r_s + R_G),` which is slightly less than even `r_s`. As range l of an ammeter is more than that of a milliammeter, hence value of shunt resistance is LESSER for an ammeter. CONSEQUENTLY, resistance of an ammeter is less or comparatively speaking resistance of a milliammeter is higher. |
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