Dr SM Saliem Associate Professor University Womens Polytechnic AMU Aligarh I SEM DIP ENGG 20202021 APPLIED PHYSICS LABI WPH191 EXPERIMENT 2 SCREW GAUGE OBJECT To determine mass per unit length of a given wire using screw gauge ID: 1002172
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2. WELCOME TO THIS VIDEO LECTURE
3. Dr SM Saliem Associate Professor University Women’s Polytechnic AMU, AligarhI SEM DIP ENGG, 2020-2021APPLIED PHYSICS LAB-I (WPH-191)
4. EXPERIMENT 2: (SCREW GAUGE)OBJECT: To determine mass per unit length of a given wire using screw gauge.APPARATUS: Screw Gauge and uniform cylindrical wire (iron metal).
5. FORMULA:m= mass per unit lengthd=diameter of wireρ=density of material of wire
6. DIAGRAM OF SCREW GAUGE:
7. PICTURE OF SCREW GAUGE
8. PITCH:Pitch p is the ratio of distance x moved by the screw and y no of rotations given to circular scale.
9. LEAST COUNT:Least count is the ratio of pitch and total number of divisions on the circular scale.
10. ZERO ERROR: FIRST READING
11. ZERO ERROR: SECOND READING
12. ZERO ERROR: THIRD READING
13. ZERO ERROR: e1= - (50-46) x 0.01 mm= - 0.04 mme2= - (50-45) x 0.01 mm= - 0.05 mme3= - (50-47) x 0.01 mm= - 0.03 mm Mean zero error e = - 0.04 mm Zero correction -e = 0.04 mm
14. OBSERVATION: DIAMETER READING #1
15. OBSERVATION: DIAMETER READING #2
16. OBSERVATION: DIAMETER READING #3
17. OBSERVATION: DIAMETER READING #4
18. OBSERVATION: DIAMETER READING #5
19. OBSERVATION TABLE:S.NOMSRm (mm)CSRnOBSERVED DIA.d0=m+nxL.C. (mm)1.2.3.4.5.2.02.02.02.02.020212220222.0+20x0.01=2.202.0+21x0.01=2.212.0+22x0.01=2.222.0+20x0.01=2.202.0+22x0.01=2.22
20. CALCULATION: Mean observed diameter d0=2.21mm Corrected diameter (d) =observed diameter+zero correction =2.21+0.04=2.25 mm d=2.25 x10-3 m Density of iron metal (ρ) ρ=7.85x103kg/m3
21. MASS PER UNIT LENGTH:
22. RESULT: Mass per unit length of the given uniform cylindrical wire (iron metal) using Screw Gauge is found to be 31.2x10-3 kg/m or 31.2 g/m
23. THANKS