In the neutral point topic , what is the orientation of the magnet?
The orientation of the magnet here with respect to earth's magnetic field is the magnet is perpendicular to the earth's magnetic field.
What is non-ohmic resistors? Give examples. What is galvanometer? How would you convert it into an ammeter?
Non-ohmic resistors are resistors that do not obey Ohm's law, meaning their resistance does not depend linearly on the applied voltage. Examples include thermistors, photoresistors, tunnel diodes, and field-effect transistors. A galvanometer is a device used to measure electric current. It can be converted into an ammeter by connecting a low resistance in series with the galvanometer. This resistance should be low enough that it does not significantly affect the current being measured, but high enough to limit the current to a safe level so that the galvanometer is not damaged.