Two charges are located on the positive − of a coordinate system. Charge 1 = 2 × 10 -9 C is 2 from the origin, and charge 2 = 3 × 10 -9 4 from the origin. What is the magnitude of the total force exerted by these two charges on a charge 3 = 5 × 10-9 located at the origin?

The earth's magnetic field, with a magnetic dipole moment of 8.0×1022am2, is generated by currents within the molten iron of the earth's outer core. suppose we model the core current as a 3000-km-diameter current loop made from a 1000-km-diameter “wire.” the loop diameter is measured from the centers of this very fat wire.to decide whether this is a large or a small current density, compare it to the current density of a 7.0 a current in a 2.0-mm-diameter wire.