An electric field is a region of space where electrically charged particles experience a force, while a magnetic field is a region of space where magnetic materials and electrically charged particles experience a force.
Electric fields and magnetic fields are closely related and are part of the electromagnetic force. A changing electric field can produce a magnetic field, and a changing magnetic field can produce an electric field.
Sources of electric fields include charged particles, such as electrons and protons, and sources of magnetic fields include magnets and moving charges, such as an electric current.
Yes, both electric and magnetic fields can be shielded or blocked. Electric fields can be blocked by insulating materials, while magnetic fields can be blocked by materials with high magnetic permeability, such as iron or steel.
Electric and magnetic fields have many practical applications, including powering electrical devices, generating electricity, and various forms of communication, such as radio waves, microwaves, and cell phones. They are also used in medical imaging, such as MRI scans, and in particle accelerators for scientific research.