Magnetic lines of force
Always intersect
Are always closed
Tend to crowd far away from the poles of magnet
Do not pass through vacuum
The small magnets each of magnetic moment $10 \,A-m^2$ are placed end-on position $0.1\,m$ apart from their centres. The force acting between them is....$N$
The field due to a magnet at a distance $ R$ from the centre of the magnet is proportional to
Two identical bar magnets with a length $10 \,cm $ and weight $50 \,gm$-weight are arranged freely with their like poles facing in a inverted vertical glass tube. The upper magnet hangs in the air above the lower one so that the distance between the nearest pole of the magnet is $3\,mm.$ Pole strength of the poles of each magnet will be.......$ amp × m$
Write the difference between electric field lines and magnetic field lines.
Calculate the axial field of a finite solenoid.