4. Consider a Copper metal shaped as an elongated parallelepiped. An electric field isapplied to this sample in the +y direction and the magnetic field is applied in the +zdirection, as schematically shown in the Figure below. (a) (2 points) Indicate the direction (choose among +x, -x, +y, -y, +z, -z) in which the moving electrons are deflected/accumulated by the magnetic field. (b) (2 points) What is the name of the force causing this deflection? (c) (2 points) Indicate the direction (choose among +x, -x, +y, -y, +z, -z) of the Hallfield (the electric field set up by the deflected electrons). (d) (14 points) A Hall effect experiment is carried out at room temperature and the following results are obtained: RH = -0.55 x 10-1ºm³A's', o = 5.9 x 107 Q''m' Calculate the drift mobility and concentrations of conduction electrons in copper.

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