Question

define 1 ohm. why 2 magnetic field lines never cut each other. compare bar magnet and electromagnet​

Answer 1

Explanation:

1. The ohm is defined as an electrical resistance between two points of a conductor when a constant potential difference of one volt, applied to these points, produces in the conductor a current of one ampere, the conductor not being the seat of any electromotive force.
2. The two magnetic field lines do not intersect each other because if they do it means at the point of intersecting the compass needle is showing two different directions which are not possible.
3. A bar magnet is a permanent magnet that can create its own persistent magnetic field whereas an electromagnet is a type of temporary magnet that can produce a magnetic field in the presence of an electric current.