Consider a 1 nC charge at the origin of a 2D coordinate system. Calculate size of the electric field the following points (see the diagram in 2.2!). Show your work for at least one calculation. Point A: (0 m, 0.4 m) Point B: (0.3 m, 0 m) Point C: (0 m, -0.4 m) Point D: (-0.3 m, 0 m) Using the values calculated in 2.1, sketch the electric field due to the 1 nC charge in the figure below. Make sure the sizes of the arrows are proportional to the values of the electric field.

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Debye Theory of Solids

In solid-state physics, debye theory is used to estimate the phonons contributing to the specific heat capacity in a solid. It explains that the specific heat is a consequence of the vibrations of the atomic lattice of the solid, which is in contrast to the Einstein model. In the Einstein model, solids are treated as independent, non-interacting quantum harmonic oscillators. This model clearly explains the low-temperature dependence of the heat capacity, which is proportional to T3. This is known as Debye T3 law.