Question
Suppose you have a $40.0 \Omega$ galvanometer with a $25.0 \mu \textrm{A}$ sensitivity. (a) What resistance would you put in series with it to allow it to be used as a voltmeter that has a full-scale deflection for 0.500 mV? (b) What is unreasonable about this result? (c) Which assumptions are responsible?
1. $-20.0 \Omega$
2. Resistance can't be negative.
3. The voltage must be more than $0.500 \textrm{ mV}$.
Solution Video