resistal the tollowing circuit diagram. Using Linear Re find the parameters of t

Question

resistal the tollowing circuit diagram. Using Linear Re find the parameters of the graph, write oe t the graph, expressing the mathematical slope and y-intercept find current in the resistor expressing The mathematical relation between the variables. From the 1) Connect the circuit above. Use a DC power supply, voltmeter, galvanometer and the decade resistoras the resistance R. Set value 3 k on the resistance box initially. If you are not sure whether it is wired correctly let me check it. 2) Turn on the power supply and increase current until the scale on galvanometer reads 3.0 Measure voltage across the power supply (not across the resistor) as it is in the diagram. Use an appropriate scale on the voltmeter so you can get the most precise results. 10k2. Always adjust the power supply so that the scale on the galvanometer rea possible precision and accuracy. t the same measurement for values of resistance 4kQ, 5kQ, 6kQ, 7k2, 8kQ, 9k2 and ds 3.0. Use an appropriate scale on voltmeter!!! If voltage is too high, change scale. Try to achieve maximunm 4) Plot the graph. 5) Identify the linear portion of the graph and use linear regression techniques to write mathematical relationship between the variables for the linear portion of the graph. 6) Explain the physical meaning of the y-intercept and the slope-state the physical relations in words as well as equations if you can. Find current in the resistor R and try to explain v your y-intercept is not zero. What parameters of the circuit you can find from y-intercept? 7) Write a complete report of your experiment, telling your goal, what you used and how it used, what you measured, tables of data, graph(s), overall results with estimates of accuracy precision, suggestions for improvements if you had to do it again, and conclusions includ broad statement of any physical principles involved

Explanation / Answer

1. in V vs R Plot, the slope is V/R

the slope of the graph shows the current passing through the resistor for a potential difference V

2. let the internal reisstance of the galvanometer be r

resistance = R

then

V = i(r + R)

V = ir + iR

V/R = ir/R + i

for r< < R

V/R = i

3. current in resistor R is

i = V/(r + R)

where r is the internal resistnace of the galvanometer

for small values of r

slope = current

fromt he graph

slope = 0.289 mA

4. the y intercept is not zero due to the internal resistnace of the gal;vanometer

0.143 = ir

i = 0.289

so r = 0.494 ohm

5. the internal ressitance of thje galvanometer can be found using the y intercept

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