1) State series and parallel combination of resistance. Explain.
2) At what temperature the velocity of sound in air is increased by 50% to that at 27°C.
3) State and explain Ampere's theorem and use it to find magnetic field due to long straight conductor carrying current.
4) In the Bohr's model of hydrogen atom the electron circulates round the nucleus in a path of radius 5.1×10^-11m at frequency of 6.8×10^15Hz. What value of B is set up at the center of the orbit.
7) Why gas becomes conducting at low pressure and high temperature?
8) Why clock oil is used in Millikan's Experiment?
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