# Physics II Lab w answers_Part_24 - 2 Total number of turns...

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59 8. Refine the error estimate for the magnetic field by using exercise 5 and recalculate ) m / e ( ) m / e ( Δ . 9. What happens to the pattern on the screen if the solenoid current is continuously increased? 10. Compare this experiment with the Thomson’ s bar magnet method for measuring e/m. References: 1. “ Fundamentals of Physics” , D.Halliday, R.Resnick and J.Walker, 6th edition, John- Wiley & sons, New York. 2. “ Electricity & Magnetism” , A.S .Mahajan and A.A.Rangwalla ,Tata –McGraw Hill, New Delhi.

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60 Experiment 9 Measurement of (e/m) by helical coil method. Observations and Results Constant values: 1. Distance between the edge of X deflecting plates and fluorescent screen, L = 9cm.
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Unformatted text preview: 2. Total number of turns in the solenoid, N = 3350. 3. Length of the solenoid, l = ____________ cm. 4. Magnetic permeability of free space, & o = 4 & x 10-7 Nm 2 / Amp 2 . Observation table : Solenoid current and accelerating voltage at focusing Calculations and results: B 1 = ( & o N I 1 ) /( l ) 8 & 2 V a (e/m ) 1 = ---------- L 2 B 1 2 = 1. V a = 250V B 2 = ( & o N I 1 ) /( l ) 8 & 2 V a (e/m) 2 = ---------- L 2 B 2 2 = (e/m) avg = B 1 = (e/m) 1 = 2. V a = 275 V B 2 = (e/m) 2 = (e/m) avg = B 1 = (e/m) 1 = 3. V a = 300 V B 2 = (e/m) 2 = (e/m) avg = I 1 = Solenoid current (forward direction) I 2 = Solenoid current (reverse direction) 1. V a = 250V 2. V a = 275V 3. V a = 300V...
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Physics II Lab w answers_Part_24 - 2 Total number of turns...

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