Thursday, November 25, 2010

 3. Effect of Electric Current PART I Mention any two differences between Peltier effect and Joule's heating effect Define peltier coefficient and write its unit. Mention the limitations of cyclotron In a galvanometer, increasing the current sensitivity does not necessarily increase the voltage sensitivity. Explain. Why is nichrome used as a heating element? Calculate the resistance of the filaments of a 100W 220V electric bulb. Define ampere in terms of force between two long parallel current carrying conductors. Define ampere in terms of force. What is neutral temperature of a thermocouple? State Ampere's circuital law. How is a galvanometer converted into (a) an ammeter. (b) a voltmeter Part-IV Apply Biot-Savart law. Obtain an expression for the magnetic induction at a point due to infinitely long straight conductor carrying current. Derive an expression for the magnetic induction due to an infinitely long straight conductor carrying current. Write the expression for the magnetic induction when the conductor is placed in a medium of permeability μ Define Ampere's circuital law. Applying it find the magnetic induction due to a long solenoid carrying current. Explain in detail the principle construction working and limitations of a cyclotron with a diagram. State Joule's law. . Explain Joule's calorimeter experiment to verify Joule's laws of heating. Deduce the relation for the magnetic induction at a point along the axis of a circular coil carrying current. Explain in detail the principle. Construction and theory of a tangent galvanometer Deduce an expression for the force on a current carrying conductor placed in a magnetic field. Find the magnitude of the force.

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