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A static magnetic field can exist in a good conductor. When the conductor carries current, it produces the flux which can exist inside the conductor. Due to this flux, magnetic field and intensity at a point inside the good conductor.
A Balanced equation is one where equal number of atoms exist on either side.
gravitational
There is no word equation, except that helium will exist as liquid phase in liquid helium
A general equation doesn't exist; this depends on type of the chemical reaction involved.
Magnetic field
An electric field can exist even without the presence of a magnetic field. An example of this is a stationary electric field.
An equation for production doesn't exist.
electromagnetic
A static magnetic field can exist in a good conductor. When the conductor carries current, it produces the flux which can exist inside the conductor. Due to this flux, magnetic field and intensity at a point inside the good conductor.
This is one of the unsolved problems in physics. Some physicists believe that magnetic monopoles (i.e., magnetic charges) should exist, but none have been found yet.
Can exist but need not.
a magnetic field
No actual 'lines' exist, but it is a useful way of describing a magnetic field, as it represents the direction the north pole of a magnet would move if it was free to do so.
Probably.
Yes, they do exist.
A Balanced equation is one where equal number of atoms exist on either side.