A single loop circuit is constructed by connecting an ideal capacitor to an ideal inductor (using ideal wires) and a switch. The switch is initially open and the charge stored by the capacitor is Q0. The switch is closed and the circuit is observed for some time. The switch is reopened at an instant when the charge stored by the capacitor is again Q0 and an iron core is inserted into the inductor (which has the affect of increasing the inductance. The switch is then closed and the circuit is observed. Which of the following parameters are larger for the second observation (the circuit after the iron core was placed in the inductor)? a) capacitance
b) time constant
c) period of oscillation
d) frequency of oscillation

-first use of geothermal energy occurred more than 10,000 years ago in north america by american paleo-indians

-the first industrial use of geothermal energy began near pisa, italy in late 18th century

-in 1904, italian scientist piero ginori conti invented the first geothermal electric power plant in which steam was used to generate the power

-with the above experiment, the first geothermal plant in usa started in 1922 with a capacity of 250 kilowatts

-however, in 1946 first ground-source geothermal heat pump installed at commonwealth building in portland, oregon

-during the 1960’s, pacific gas and electric began operation of first large scale geothermal power plant in san francisco, producing 11 megawatts

-in 1973, when oil crisis began many countries began looking for renewable energy sources and by 1980’s geothermal heat pumps (ghp) started gaining popularity in order to reduce heating and cooling costs

-as effect of climate change started showing results, governments of various countries joined hands to fight against it, for which kyoto protocol was signed in japan in 1997, laid out emission targets for rich countries and required that they transfer funds and technology to developing countries, 184 countries have ratified it

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