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the galvameter deflection , when key K(1...

the galvameter deflection , when key `K_(1)` is clossed but `K_(2)` is open equals `theta_(0)` (see figure ) On clossing `k_(2)` also and adjusting `R_(2) ` to ` 5Omega` , the deflection in galvanometer becomes `(theta_(0))/(5)` the resistnce of the galvanometer is then , given by [Neglect the internal resistance of battery]:

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