the deflection in a moving coil galvenometre falls from `50` divisions to `10` divisions when a shunt of `12 Omega` is applied. What is the resistance of the galvenometre? Assume the main current to remain same.
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In case of a galvanometer, `I prop theta`. Given `I_(G)/(I) = (10)/(50) = (1)/(5)` i.e., `I_(G) = (1)/(5)I` Now a sin case of a shunted galvanometer as shows in fig. `(I - I_(G)) S = I_(G)` or `(I - (1)/(5) I) xx 12 = (1)/(5) IG` or `G = 4 xx 12 = 48 Omega`
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