14. 0/1 points I Previous Answers CJ10 20.P.088. My Notes Ask Your Teacher The c

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14. 0/1 points I Previous Answers CJ10 20.P.088. My Notes Ask Your Teacher The coil of wire in a galvanometer has a resistance of RC 69.0 . The galvanometer exhibits a full-scale deflection when the current through it is 0.380 mA. A resistor is connected in series with this combination so as to produce a voltmeter. The voltmeter is to have a full-scale deflection when it measures a potential difference of 20.0 V. What is the resistance of this resistor? 52.63 I× Additional Materials Section 20.11

Explanation / Answer

The coil of wire in a galvanometer has a resistance of Rc =69.0 ohms .

The galvanometer exhibits a full-scale deflection when the current through it is 0.380 mA.

A resistor is connected in series with this combination so as to produce a voltmeter.

The voltmeter is to have a full-scale deflection when it measures a potential difference of 20.0 V.
What is the resistance of this resistor?

FS voltage is 20.0 v
FS current is 0.380 mA
so R = 20.0 v / 0.380 mA = 52.63 kohms
subtract from that the 69.0 ohms to get 52.56 kohms.

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