Acurrent i flows through a rectangular bar of copper with cross sectional area a, length l, density p, molar mass m and conductivity o. a uniform magnetic field b is applied perpendicular to the direction of current flow (a) make a drawing of this situation, clearly indicating locations where there is an accumu or negative charge. find an expression for the resulting induced electrical field eind in terms of b, the electron charge e, and relevant properties of the copper bar [12 marks lation of positive (b) find an expression for the ratio of egnd and the electric field associated with the current ecur. estimate this ratio if a = 3.75 x 10-4 m2, / = 0.20 m, b 0.10 t, p 8.96 g/cm3, 63.54 g/mole, and o = 5.92 x 107 a/v. m [6 marks (c) determine the poynting vectors associated with eind and ecur, and estimate the corre- sponding stored electromagnetic linear momentum 9 marks] (e) what do you expect the linear momentum associated with the motion of charges in the 3 marks system to be, and why?

How do the measurements of charge at the different locations on the sphere compare to each other? the charge measurements are different at all locations on the sphere. the charge measurements are virtually not the same at all locations on the sphere except for the charge at the very top and at the very bottom that are equal. the charge measurements are virtually the same at all locations on the sphere except for the charge at the very top. at the top, the conductive sphere has a small disk that is made of different material. the charge measurements are the same at all locations on the sphere. what happens to the charge on the conductive sphere when it is connected to a source of charge such as the electrostatic voltage source? nothing will happen because no charge goes around the surface of the sphere. the charge on the conductive sphere spreads out over the surface of the sphere; being greater in some specific locations on the sphere. the charge on the conductive sphere spreads out uniformly over the surface of the sphere. the charge on the conductive sphere spreads out non-uniformly over the surface of the sphere.

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Aphoton is absorbed by an electron that is in the n = 3 state of a hydrogen atom, causing the hydrogen atom to become ionized. very far away from the nucleus, the released electron has a velocity of 750,000 m/s. what was the wavelength of the absorbed photon?