1. Which variable does the lab manual use to denote the internal resistance of t

Question

1. Which variable does the lab manual use to denote the internal resistance of the galvanometer coil?
a. r b. Ig c. M d. V e. s f. R
2. Which variable does the lab manual to represent the current needed to cause a full scale deflection of the pointer?
a. r b. Ig c. M d. V e. s f. R
3. To use the galvanometer as a voltmeter, the external resistance is added where?
a. In series with the part being measured c. In series with the galvanometer b. In parallel with the part being measured d. In parallel with the galvanometer
4. To use the galvanometer as an ammeter, the external resistance is added where?
a. In series with the part being measured c. In series with the galvanometer b. In parallel with the part being measured d. In parallel with the galvanometer
5. For a voltmeter, the external resistance combined with the galvanometer should be _____.
a. large b. small
6. For an ammeter, the external resistance combined with the galvanometer should be _____, so that the ammeter offers negligible resistance.
a. large b. small
7. In the lab, to turn your galvanometer into an ammeter, you will construct a shunt resistor out of copper wire that has a resistance of 0.000530 Ohms/cm. If you want a shunt resistance of 0.0105 Ohms, how long should your wire shunt be?
a. 19.8 cm b. 0.0505 cm c. 5.56x10-6 cm
8. In part C, Ammeter, where do you connect your leads to your galvanometer?
a. plug into the binding posts/terminals b. connect alligator clips to the straight ends of the wire shunt
9. During the lab experiment, you will use equation 1 to find the multiplier resistance, M, that should give your galvanometer voltmeter a full-scale deflection (500 divisions) for 3.00 volts. This means your scale for converting galvanometer divisions to volts is 3.00 volts per 500 divisions. If you measured 420 divisions when your power supply was set to 2.50 volts, how many volts did your galvanometer measure?
a. 2.52 volts b. 4.2 volts c. 2.50 volts d. 3.00 volts
10. As a part of this lab, your instructor is asking you to estimate the uncertainty of your analog galvanometer (see Analog Galvanometer data sheet). The very last sentence of Appendix C (pg C-2) says to estimate the analog meter readings to 1/3 of the smallest division. That is because the smallest divisions are fairly widely spaced on the analog galvanometer. Each tick mark on the galvanometer represents 20 divisions (e.g., 0, 20, 40, 60, 80,

Explanation / Answer

1. Which variable does the lab manual use to denote the internal resistance of the galvanometer coil?

Ans. (a) r

2. Which variable does the lab manual to represent the current needed to cause a full scale deflection of the pointer?
Ans. (b). Ig

3. To use the galvanometer as a voltmeter, the external resistance is added where?
Ans. (d). In parallel with the galvanometer

4. To use the galvanometer as an ammeter, the external resistance is added where?
Ans. ( c). In series with the galvanometer

5. For a voltmeter, the external resistance combined with the galvanometer should be _____.

Ans. a. large

6. For an ammeter, the external resistance combined with the galvanometer should be _____, so that the ammeter offers negligible resistance.

Ans. b. small

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