The force on an 4.93 m wire that is perpen dicular to Earth's magnetic field is 0.181 N. What current flows through the wire? The earth magnetic field is 5 * 10 ^ - 5 * T T. Answer in units of kA.

Aspring with an unstrained length of 0.071 m and a spring constant of 2.6 n/m hangs vertically downward from the ceiling. a uniform electric field directed vertically upward fills the region containing the spring. a sphere with a mass of 5.29 10-3 kg and a net charge of +7.2 µc is attached to the lower end of the spring. the spring is released slowly, until it reaches equilibrium. the equilibrium length of the spring is 0.058 m. what is the magnitude of the external electric field?