GEOLOGY

Detailed explanation-1: -"A magnetic field is the area around a magnet, magnetic object, or an electric charge in which magnetic force is exerted.” Huh? Let’s put it this way. The invisible area around a magnetic object that can pull or push another object is called a magnetic field.

Detailed explanation-2: -A magnetic field is an invisible force field created by a magnet or as a consequence of the movement of electric charges (flow of electricity). The magnitude (intensity) of a magnetic field is usually measured Tesla (T or in mT), but it can also be measured in Gauss (G).

Detailed explanation-3: -The correct answer is D. Magnet has an invisible magnetic field which attracts objects made of iron and nickel.

Detailed explanation-4: -Magnetic Field is the region around a magnetic material or a moving electric charge within which the force of magnetism acts. A magnetic field is a vector field in the neighbourhood of a magnet, electric current, or changing electric field in which magnetic forces are observable.