Question

how do you know about field lines as one cannot see them​

Answer 1

Answer:

by doing compass needle deflection experiment as follows:

1. place a compass needle at the north pole of a bar magnet the needle shows deflection .
2. draw a line in the direction of deflection
3. place second compass needle at line drawn in the direction of deflection draw line again in the direction of deflection and hence by drawing lines you will reach at south pole

Answer 2

Answer:

hi please mark as brilliant pleae be friends