# Physics II Lab w answers_Part_37 - John-Wiley& sons New...

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85 III. Exercises and Via Questions: 1. Define paramagnetic, diamagnetic & ferromagnetic substances. Give one example of each. 2. Why the M vs. B curve called the hysterisis curve? 3. Derive eq (6). 4. What is the need to align the solenoid along the E – W direction? 5. Will the hysterisis curve be different if this alignment were not done? If yes why? 6. How does the demagnetization setup demagnetize the rod? 7. It is said that dropping the specimen rod on a hard surface also serves to remove any small residual magnetization . Is it true ? If so give reason. 8. Draw a small figure showing how the hysterisis curve would develop over many cycles of the current. 9. How would the retentivity & coercivity change with temperature? Do you think that they should depend on the geometry of the sample? 10. Identify the main sources of error in your experiment. References: 1 . “ Fundamentals of Physics” , D.Halliday, R.Resnick and J.Walker, 6th edition,

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Unformatted text preview: John-Wiley & sons, New York 2001. 2. “ Physics” , M.Alonso and E.J.Finn, Addison-Wiley, 1992. 3. “ Introduction to Electrodynamics” , D.J.Griffiths ,PHI, 1998. Observations and results 1. Distance, r = __________________________ m 2. Length of specimen, l = __________________ m 3. No. of turns per unit length of solenoid , n = 1600 turns/m . 4. Area of cross-section of rod , S = 1.84 x 10-5 m 2 . 5. Horizontal component of earth’ s magnetic field ,B E = 3.53 x 10-5 T . 86 Table : Current through S & deflection & Deflection (forward current) Degree. Deflection (reverse current) Degree Deflection (forward current) Current I (A) & 1 & 2 & avg Tan & & 1 & 2 & avg Tan & & 1 & 2 & avg Tan & 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.4 1.3. 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0...
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Physics II Lab w answers_Part_37 - John-Wiley& sons New...

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