The electronic ammeter in example 4.9 has been modified and is shown in figure. The selector switch allows the user to change the range of the meter. Using values for R1 and R2 from Example 4.9, fine the values of RA and RB that will yield a 10-V output when the current being measured is 100mA and 10mA, respectively.

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Rc = 1 kN Unknown current RA RB Voltmeter R2 = 9 kN R1 = 1 kN Selector switch