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Q. A thin circular disk of charge density (sigma) and radius a rotates with angular velocity (omega) about an axis through its
center in the plane of the disk. Describe the radiation field using the multipole expansion method.

Q. The heat of vaporization of ethyl alcohol is about 200 cal/g. If 1.3 kg of it were allowed to vaporize in a refrigerator, how many grams of ice would be formed from 0°C water?

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