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Electrical circuits

# Electrical circuits - Date Physics 211L Electrical Circuits...

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Unformatted text preview: Date:_22/03/2007 __ Physics 211L Electrical Circuits Name: __Sarah Karam________________ Section number: ___-1-___ Name: ___Farid El Braidy_____________ Instructor:_Ms. Sara Najm_ ______ I. Wheastone Bridge : (a) Resistivity of a metallic coil : Coil Uncertainties R 1 ( Ω ) 50 1 % L 2 (measured from above) 7.17 XXXXXXXXX 7.18 XXXXXXXXX L 2 (measured from below) 7.18 XXXXXXXXX 7.19 XXXXXXXXX Average value of L 2 (cm) 7.18 0.004123 R x ( Ω ) 127.3049 0.19 Mean diameter of coil (cm) 13.0 0.3 Length of coil wire 20,420.35 cm Diameter of wire (mm) 0.2 Resistivity ( ρ ) ( Ω m) 1.9575 × 10-8 9.309×10-12 Calculate the value of ρ and its uncertainty and record it in the table above (Show your work). Can you tell from your measurements, what metal is the wire made of (Answer this question after you complete part B)? • R x = 2 2 1 1 1 2 7.18 50 127.3049 10 10 7.18 L L R R L L = = × = Ω -- • ( 29 2 __ 2 2 0.004123 1 i L sys L L N N α α - = + =- ∑ cm • 1 2 10 2.82 L L =- = cm. So, 2 1 1 2 2 2 0.00162 L L L dL dL α α α = = = cm 1 Grade: • 2 1 1 2 2 1 2 1 2 1 2 2 1 1 2 1 1 2 2 2 2 1 1 + + = + +...
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Electrical circuits - Date Physics 211L Electrical Circuits...

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