{"id":4136,"date":"2026-01-06T09:16:31","date_gmt":"2026-01-06T03:46:31","guid":{"rendered":"https:\/\/vajiramandravi.com\/upsc-exam\/?p=4136"},"modified":"2026-01-07T12:01:40","modified_gmt":"2026-01-07T06:31:40","slug":"electricity-and-magnetism","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/upsc-exam\/electricity-and-magnetism\/","title":{"rendered":"Electricity and Magnetism, Definition, Comparison, UPSC Notes"},"content":{"rendered":"

Electricity and magnetism<\/strong>\u00a0come from electric charges and magnetic fields. We see them in everyday things like static electricity and moving currents, as well as in magnets. Together, they make electromagnetism, which is important in technology, transportation, and medicine.<\/p>\r\n

For example, they help generate power, run motors, and even make medical tools like MRI machines work.<\/p>\r\n

Electricity Overview<\/strong><\/h2>\r\n

Electricity<\/strong>\u00a0is a physical phenomenon that is caused by the\u00a0presence<\/strong>\u00a0and\u00a0movement<\/strong>\u00a0of electric charges. It manifests itself in a variety of ways, such as\u00a0static electricity, electric currents,<\/strong>\u00a0and\u00a0electromagnetic fields.<\/strong><\/p>\r\n

    \r\n\t
  • In most electrical processes,\u00a0electrons\u00a0<\/strong>are the main carriers of electric charge.<\/li>\r\n\t
  • Ions<\/strong>\u00a0(charged atoms or molecules) can transport electric charge in some instances, particularly in\u00a0solutions or gases.<\/strong><\/li>\r\n<\/ul>\r\n

    Types of electricity<\/strong><\/p>\r\n

      \r\n\t
    • Static:<\/strong>\u00a0Static electricity is a\u00a0buildup of electric charge<\/strong>\u00a0on a surface caused by\u00a0friction<\/strong>\u00a0and remains stationary until released, like the shock from touching a doorknob after walking on a carpet.<\/li>\r\n\t
    • Current:<\/strong>\u00a0It is the flow of electric charge through a conductor, like electrons moving through a wire. It can be alternating (AC) or direct (DC) current.\r\n\r\n
        \r\n\t
      • Alternating current (AC)<\/strong>\u00a0is a flow of electric charge that\u00a0periodically reverses direction.<\/strong><\/li>\r\n\t
      • Direct current (DC)<\/strong>\u00a0is a flow of electric charge in a\u00a0constant direction,<\/strong>\u00a0normally produced by\u00a0batteries.<\/strong><\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n
        \"electricity-electron-flow.webp\"<\/figure>\r\n

        Types of Materials<\/strong><\/h3>\r\n

        Conductors, insulators, and semiconductors\u00a0<\/strong>are the materials essential in electronics, with conductors like copper allowing easy flow of electricity, insulators like rubber preventing it, and semiconductors like silicon enabling controlled conductivity.<\/p>\r\n

        \r\n\r\n\r\n\r\n\r\n\r\n
        Property<\/strong><\/td>\r\nConductors<\/strong><\/td>\r\nInsulators<\/strong><\/td>\r\nSemiconductors<\/strong><\/td>\r\n<\/tr>\r\n
        Electrical resistivity<\/strong><\/td>\r\n- Low<\/td>\r\n- High<\/td>\r\n- Intermediate<\/td>\r\n<\/tr>\r\n
        Ability to conduct electricity<\/strong><\/td>\r\n- High<\/td>\r\n- Low<\/td>\r\n- Intermediate<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n

        Applications of Electricity<\/strong><\/h3>\r\n

        Electricity plays a key role in modern society, powering everything from household equipment to large plants. In recent years, it has played a significant role in transforming vehicles from fossil fuel-based to clean energy.<\/p>\r\n

          \r\n\t
        • Residential and commercial applications:\u00a0<\/strong>Electricity is necessary in homes and businesses for\u00a0running equipment.<\/strong><\/li>\r\n\t
        • Transportation: Electric vehicles (EVs),<\/strong>\u00a0which include are becoming more popular due to their efficiency and low environmental impact.<\/li>\r\n\t
        • Communication:\u00a0<\/strong>Electrical power is required for\u00a0data centres, transmission towers,\u00a0<\/strong>and\u00a0networking equipment.<\/strong><\/li>\r\n\t
        • Medical industry:<\/strong>\u00a0Important for running diagnostic equipment such as\u00a0MRI machines, X-ray machines,<\/strong>\u00a0and\u00a0patient monitoring systems.<\/strong><\/li>\r\n\t
        • Manufacturing industry:\u00a0<\/strong>From powering machinery to managing automation systems in manufacturing plants electricity is required.<\/li>\r\n\t
        • Computers and electronics: Electricity powers personal computers, cellphones, tablets,<\/strong>\u00a0and other\u00a0electronic devices.<\/strong><\/li>\r\n<\/ul>\r\n

          Magnetism Overview<\/h2>\r\n

          Magnetism<\/strong>\u00a0is a phenomenon related to magnetic fields that form as electric charges move. This motion can take various forms, including an electric current in a\u00a0conductor,\u00a0<\/strong>charged particles moving through space, or electron mobility in an\u00a0atomic orbital.<\/strong><\/p>\r\n

            \r\n\t
          • Magnetic fields<\/strong>\u00a0cause the deflection of moving charges and exert torques on other magnetic objects.<\/li>\r\n\t
          • Sources of magnetism:\u00a0<\/strong>Electric current loops and orbiting electrons, which have a magnetic dipole moment and resemble small bar magnets in an external magnetic field, generate magnetic fields.<\/li>\r\n<\/ul>\r\n

            Magnetic Properties of Matter<\/strong><\/h3>\r\n

            The\u00a0magnitude<\/strong>\u00a0and\u00a0alignment\u00a0<\/strong>of dipole moments have an impact on susceptibility, which determines the magnetic properties of matter. The magnetic materials, based on their behaviour in magnetic fields, are classified into three types.<\/p>\r\n

              \r\n\t
            • Diamagnetic materials: Bismuth\u00a0<\/strong>and\u00a0copper,\u00a0<\/strong>are magnetised in the opposite direction of an external magnetic field, resulting in a\u00a0repulsive effect\u00a0<\/strong>when subjected to a weak magnetic field.<\/li>\r\n\t
            • Paramagnetic materials:Aluminium\u00a0<\/strong>and\u00a0oxygen<\/strong>, for example, are attracted by an\u00a0external magnetic field\u00a0<\/strong>and create internal induced magnetic fields, resulting in a weak attraction.<\/li>\r\n\t
            • Ferromagnetic materials:<\/strong>\u00a0Such as\u00a0iron, cobalt,\u00a0<\/strong>and\u00a0nickel,<\/strong>\u00a0have a\u00a0high positive sensitivity<\/strong>\u00a0to an external magnetic field and can maintain it once it is removed.<\/li>\r\n<\/ul>\r\n
              \"magnetic-field.webp\"<\/figure>\r\n

              Applications of Magnetism<\/strong><\/h3>\r\n

              Magnetism has multiple applications in diverse fields of\u00a0commerce.\u00a0<\/strong>The\u00a0various alloys of nickel, cobalt,\u00a0<\/strong>and\u00a0iron<\/strong>\u00a0are some of the materials with great magnetic qualities; thus, they are used in specialised devices.<\/p>\r\n

                \r\n\t
              • Electric motors and generators:\u00a0<\/strong>\u00a0Magnetism is necessary in\u00a0transferring\u00a0<\/strong>electrical energy to mechanical energy and vice versa in electric motors and generators.<\/li>\r\n\t
              • Data storage:<\/strong>\u00a0Magnetic storage devices, such as hard drives, employ magnetic fields to store data.<\/li>\r\n\t
              • Medical imaging:Magnetic Resonance Imaging (MRI)<\/strong>\u00a0is a medical imaging technique that generates detailed images of the inside of the body by using powerful\u00a0magnetic fields and radio waves.<\/strong><\/li>\r\n\t
              • Magnetic levitation:<\/strong>\u00a0This technology lifts and propels vehicles like trains using magnetic repulsion.<\/li>\r\n\t
              • Compasses:<\/strong>\u00a0Traditional compasses use a small\u00a0magnetised needle<\/strong>\u00a0that aligns with the Earth's magnetic field to\u00a0aid navigation.<\/strong><\/li>\r\n\t
              • Electromagnets:<\/strong>\u00a0They are used in lifting large metal objects in scrapyards and play an important role in scientific equipment such as\u00a0particle accelerators.<\/strong><\/li>\r\n\t
              • Magnetic sensors and devices:<\/strong>\u00a0These include devices such as\u00a0Hall effect sensors,\u00a0<\/strong>which are used for position sensing in\u00a0automotive<\/strong>\u00a0and\u00a0industrial applications.<\/strong><\/li>\r\n\t
              • Credit cards and security systems:Magnetic strips<\/strong>\u00a0on credit cards as well as certain security systems store and read data using magnetic fields.<\/li>\r\n<\/ul>\r\n

                Comparison Between Electricity and Magnetism<\/h2>\r\n

                The two related terms that are thought to have given origin to the study of\u00a0electromagnetism\u00a0<\/strong>are electricity and magnetism. It is said that a magnetic field results from current electricity. While electricity is produced by a shifting magnetic field.<\/p>\r\n

                \r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
                The basis for Comparison<\/strong><\/td>\r\nElectricity<\/strong><\/td>\r\nMagnetism<\/strong><\/td>\r\n<\/tr>\r\n
                Basic nature<\/strong><\/td>\r\n- Electricity is the result of the flow of charged particles.<\/td>\r\n- Magnetism is the attractive or repulsive force that arises from the interaction of moving charges.<\/td>\r\n<\/tr>\r\n
                Caused by<\/strong><\/td>\r\n-Static (stationary)<\/strong>\u00a0and\u00a0moving charges<\/strong>\u00a0are capable of causing electricity.<\/td>\r\n- Specifically arises due to\u00a0moving charges<\/strong>.<\/td>\r\n<\/tr>\r\n
                Monopoles<\/strong><\/td>\r\n- Electric monopoles, or\u00a0single charges,<\/strong>\u00a0exist.<\/td>\r\n-\u00a0Only dipoles are observed.<\/strong><\/td>\r\n<\/tr>\r\n
                Characteristic feature<\/strong><\/td>\r\n- Electricity is an\u00a0invisible force<\/strong>\u00a0in nature.<\/td>\r\n- Magnetism is regarded as a\u00a0byproduct of electricity.<\/strong><\/td>\r\n<\/tr>\r\n
                Associated with<\/strong><\/td>\r\n- Electricity is associated with\u00a0positive and negative\u00a0<\/strong>charges.<\/td>\r\n- Magnetism is associated with the\u00a0north and south poles.<\/strong><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n

                Electricity and Magnetism UPSC\u00a0PYQs<\/h2>\r\n

                Question 1:<\/strong>\u00a0With reference to \u2018Li-Fi\u2019, recently in the news, which of the following statements is\/are correct?\u00a0(UPSC Prelims 2016)<\/strong><\/p>\r\n

                  \r\n\t
                1. It uses light as the medium for high-speed data transmission.<\/li>\r\n\t
                2. It is a wireless technology and is several times faster than \u2018WiFi\u2019.<\/li>\r\n<\/ol>\r\n

                  Select the correct answer using the code given below.<\/p>\r\n

                    \r\n\t
                  1. 1 only<\/li>\r\n\t
                  2. 2 only<\/li>\r\n\t
                  3. Both 1 and 2<\/li>\r\n\t
                  4. Neither 1 nor 2<\/li>\r\n<\/ol>\r\n

                    Answer: (c)<\/strong><\/p>","protected":false},"excerpt":{"rendered":"

                    Check Electricity and Magnetism complete UPSC Physics notes here. Also check about Electricity and Magnetism, Definition, Comparison, UPSC Notes PDF<\/p>\n","protected":false},"author":6,"featured_media":7983,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[173],"tags":[220,40],"class_list":{"0":"post-4136","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-quest-level-3","8":"tag-electricity-and-magnetism","9":"tag-quest"},"acf":[],"_links":{"self":[{"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/posts\/4136","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/comments?post=4136"}],"version-history":[{"count":1,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/posts\/4136\/revisions"}],"predecessor-version":[{"id":19968,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/posts\/4136\/revisions\/19968"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/media\/7983"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/media?parent=4136"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/categories?post=4136"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/tags?post=4136"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}