ABSTRACT An electromagnet was used to provide a magnetic field to 3 different conducting samples: n type Geranium (n-Ge), p type Geranium (p-Ge), and silver (Ag). A calibrated Hall probe was used to obtain the current ($_{mag}$) to magnetic field ($$) calibration of the iron-core electromagnet. The Hall voltages (VH) produced by each of the three samples were plotted against B, and a linear line was produced, as expected. The slope (${\Delta B}$) of each of the graphs were used to calculate the Hall coefficient for each sample, which we found to be $-4.99\cdot 10^{-3}\pm -0.0998 \cdot 10^{-3}}{}$, $5.64 \cdot 10^{-3}\pm 0.11 \cdot 10^{-3} }{}$, $-2.24 \cdot 10^{-10}\pm -0.04 \cdot 10^{-10} }{}$ respectively. These do not really agree with given values of $-5.6\cdot 10^{-3}}{}$ for n-Ge, $6.6\cdot 10^{-3}}{}$ for p-Ge, and $-8.9\cdot 10^{-11}}{}$ for silver by the manufacturer. Using the Hall coefficients, we found their carrier densities to be −1.25 ⋅ 10²¹ ± 0.025 ⋅ 10²¹m−3 for n-Ge, 1.11 ⋅ 10²¹ ± 0.02 ⋅ 10²¹m−3 for p-Ge, −2.79 ⋅ 10²⁸ ± 0.06 ⋅ 10²⁸m−3 for silver, which are all in the same order of magnitude as the given absolute values of 1.2 ⋅ 10²¹m−3, 1.1 ⋅ 10²¹m−3, 6.6 ⋅ 10²⁸m−3. A current was applied to the superconductor Bi₂Sr₂Ca₂Cu₃O₁₀ which was cooled in liquid nitrogen until it became superconducting, and was allowed to warm slowly. Its voltage and temperature were monitored in the warming process which we used to produce a graph of voltage against temperature. The graph showed a transition temperature of about 118K ± 2K, similar to the provided critical temperature of 108K.