![]() The horizontal component of the earth’s magnetic field at the place is 3×10 -5 Tesla. Estimate the value of the induced emf and the current in the coil. It is rotated about its vertical diameter through 180 ° in 0.25 seconds. The electric fields and the absorbed power per unit volume of tissue were calculated. A circular coil of the radius of 10 cm, 500 turns and resistance of 2? are placed with its plane perpendicular to the horizontal components of the earth’s magnetic field. magnetic induction device that is placed concentrically about the long. In the case of a closely wound coil of N turns, the change of flux associated with each turn is the same and so the total induced emf or magnetic induction is given by Here, \(\phi_b\) is the magnetic flux, \(\epsilon\) is the EMF and t is the time. The negative sign shows that current I and magnetic field B which is opposite to the direction of change in flux are produced. ![]() Magnetic Induction Formulaįrom Faraday’s law, EMF in a closed circuit is given as – This law states that the ‘rate of change of magnetic flux in a circuit induces an emf in it.’ The magnitude of the induced emf in a circuit is equal to the rate of change of magnetic flux through that circuit. ![]() Faraday’s experiments resulted in the conclusion that an emf is induced in a coil when the magnetic flux through that coil changes with time. ![]()
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