Q. The Hall voltage across a conductor in a 42 mT magnetic field is 1.9 mu V. When used with the same current in a different magnetic field, the voltage across the conductor is 2.7 mu V.
Q. A spacecraft of 140 kg mass is in a circular orbit about the Earth at a height h = 4RE. What is the spacecraft's kinetic energy?
Find the numerical value of the angular momentum.