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What about it if voltage is halved?, Ans. a. Joule heating effect., 2, b. Since H = V t/R, when resistance is halved heat will be doubled., 2 When electric current passes through current carrying conductor or coil then a magnetic field is produced around it. The working of appliances like electricCHAPTER – 13 MAGNETIC EFFECTS OF ELECTRIC CURRENT In this chapter, we will study the effects of electric current : 1. Hans Christian Oersted (1777-1851) Magnetic Effects of Electric. Current If a magnetic compass is placed near a conductor carrying current (wire), the needle is deflected. In this chapter we will study electric components and devices which are represented by symbols in a circuit diagram, heating effect of current and magnetic. So, when electric current passes through a wire, it behaves like a magnet. This is the magnetic effect of the electric current. In fact, an electric current It means that the electric current through the copper wire has produced a magnetic effect. Thus we can say that electricity and magnetism are linked to each. Nature of science: Although Ohm and Barlow published their findings on the nature of electric current around the same time, little credence was given to Ohm.