The figure below is a graph of the induced emf versus time for a coil of N turns rotating with angular speed in a uniform magnetic field directed perpendicular to the coil's axis of rotation. Copy this sketch (on a larger scale), and on the same set of axes show the graph of emf versus t. On the same graph, plot the following changes and provide answers to the corresponding questions. & (mV) 10 -51 حة -10 t (ms) (a) The number of turns in the coil is doubled which causes the amplitude to ---Select--- (b) The angular speed is doubled which causes the amplitude to ---Select--- (c) The angular speed is doubled while the number of turns in the coil is halved which causes the amplitude to ---Result--- Need Help? Read It and the period to -Select--- and the period to ---Result--- and the period to✓---Result--- double decrease by half remain unaffected

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Electromagnets

The word "electromagnet" is composed of two words, ‘electro’ and ‘magnet’. It is a type of magnet in which an electric current helps in the generation of a magnetic field. Electromagnets usually consist of two major parts, wire and a coil around which the wire is wound. This is called a solenoid. When an electric current is allowed to pass through the coiled wire, the electric current produces a magnetic field. This magnetic field is present only when current is passing through the wire.