Description: After studying this lesson, you should be able to learn about, magnetic field and its SI unit, elements of earth’s magnetic field and relation between them, the magnetic effect of electric current : Oersted’s experiment, Biot-Savart’s law and its applications, Ampere’s circuital law and its application, the motion of a charged particle in uniform electric field and magnetic field, the construction and working of a cyclotron, an expression for the force experienced by a current carrying conductor placed in a uniform magnetic field, an expression for the force between two infinitely long current carrying conductors placed parallel to each other, the working principle of a galvanometer, an ammeter and a voltmeter