GEOLOGY

Detailed explanation-1: -Answer: The statement “Magnetic lines of force are invisible” is true. Explanation: A magnetic field is an area around a magnet or a magnetic object. The magnetic field lines are imaginary lines that represent the direction of the magnetic field.

Detailed explanation-2: -Magnetic fields are not visible because it was not important during evolution to acquire that capability. That makes sense when you look where to find magnetic fields in nature. There is the field of Earth, that can be used for navigation.

Detailed explanation-3: -Magnetism is a fascinating invisible force – it influences the environment around it. A magnet is a material that can pull certain types of metal towards itself. Unlike many other forces, magnetism doesn’t have to touch the objects it affects. Gravity is also an invisible force that acts at a distance.

Detailed explanation-4: -Magnetic forces are non contact forces; they pull or push on objects without touching them. Magnets are only attracted to a few ‘magnetic’ metals and not all matter. Magnets are attracted to and repel other magnets.

Detailed explanation-5: -Magnetism is the force exerted by magnets when they attract or repel each other. Magnetism is caused by the motion of electric charges. Every substance is made up of tiny units called atoms.