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Physics of solids
A piece of Cu and another of Ge are cooled from room temp to -1500 C. The resistance of?
- Each of them increases
- Cu increases and that of Ge decreases
- Cu decrease and that of Ge increases
- Each of them decreases
Cu decrease and that of Ge increases
The resistivity of semiconductors increases with a decrease in the temperature while for conductors it decrease with a decrease in the temperature. As opposed to metals, semiconductors have high negative temperature.
A DC battery can pass current continuously through?
- I only
- I and II only
- I and III only
- I, II and III
I and III only
DC current cannot flow through a capacitor continuously because of the presence of an insulating medium between the plates of the capacitor.
Water hose with internal radius of 0.01m has water flowing at the rate of 10 kg per 20s. What is the water speed at the outlet? Density of water is 1000 kg/m3.
From continuity equation A*V = flow rate of water = volume/s;
Volume/s = mass/s * density = 0.5/1000;
A*V = 0.5/1000; A = 3.14 * (0.01)2;
V = 0.5/ (3.14*(0.01)2*1000) = 1.6m/s