Two small spheres each having mass m kg and charge q coulomb are suspended from a point by insulating threads each L m log but of negligible mass. If theta is the angle each string makes with the vertical when equilibrium has been attained. Show that q^2 = (4mgL^2 sin^2theta tan(theta)) 4(pi)ɛo.​

The space within which a test north pole experiences a force magnetic poles 2. a powerful stream of electrons flowing high above the earth in the ionosphere electrojet 3. a concept to explain the directional nature of a magnetic field field lines 4. coil of wire designed to produce a magnetic field by a current passing through its windings ionosphere 5. that region above the earth's atmosphere where particles exist in an ionized state magnetic field 6. the extremities of a magnet where the field lines tend to converge or concentrate aurora borealis 7. a phenomenon that occurs in the northern latitudes; the northern lights solenoid