Lag1989 problem number 15.3

Lag1989 problem number 15.3

How does the resistance rsh need to be shunted with a switch galvanometer with a scale of n = 10 divisions (dividing price C = 5 μA, internal resistance r = 100 Ohm) so that it can be used to measure current with a current up to I = 0.5 mA?

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