Is there any tools or equipment to visualize magnetic field?

the light bulb method is not at all practical because you wont be encountering that strong a field.(besides you can only verify if there is a magnetic field but cannot visualize it)..generally you will encounter magnetic field generated by a current wire or a permanent magnet..

just take some small iron pins or grounded iron (with small long bits)..place a paper beneath the magnet and gently tap the paper with iron pins you can see a lined pattern emerging ,the lines represent the magnetic lines of force and their direction at any point represents the direction of the field and their closeness represents their strength...you can do the same in case of a wire,just take the wire

perpendicular to the paper and through it...

some solid solutions right here between some obtuse or perhaps incorrect ones. particular to the top wording of the question: the electrical powered container is going out from the charge, and would not loop returned upon itself. at an identical time as the magnetic container itself is created by utilising shifting electric powered charge (yet not the static electric powered container created by utilising a table sure charge!), and continually loops returned upon itself. This latter assets is represented as one in each and every of Maxwell's/Heavisides' Equations. The equation in question states that the divergence of a magnetic container is comparable to 0. This describes our cutting-edge information that the magnetic container or lines do not originate from a component charge, in assessment to an electric powered container. And that, returned, the magnetic container itself has no line ends, through fact the lines (or container) continually varieties a non-supply up loop returned upon itself.

Move around a wire connected to a lightbulb. If there is a sufficiently strong magnetic field (or you move the wire fast enough) then the bulb will light up.

Well it's rather complicated. I've seen small but never amateur versions of this machine. What I know does what your asking is an MRI, or NMRI machine.