This Question Is In Two Parts Part 1 Is About The Electrical And Magnetic Characteristics Of A Loudspeaker Part 2 Is A 1 (424.15 KiB) Viewed 50 times
This Question Is In Two Parts Part 1 Is About The Electrical And Magnetic Characteristics Of A Loudspeaker Part 2 Is A 2 (68.86 KiB) Viewed 50 times
This question is in two parts. Part 1 is about the electrical and magnetic characteristics of a loudspeaker. Part 2 is about vibrations and waves. Part 1 Electrical and magnetic characteristics of a loudspeaker The diagram shows the main features of a loudspeaker L. A current-carrying coil is positioned within the magnetic field provided by a permanent magnet. The diagram also shows the directions of the magnetic field and of the current in the coil at a particular instant. The dust cap a prevents dust from blocking the gap between the cardboard tube and the south pole of the magnet. current leaving the coil out of plane of page l coll coil wound around cardboard tube H T coil wound around cardboard tube current entering the coil into plane of page permanent magnet The coil consists of 150 turns, each of average diameter 2.5 cm. The magnetic field of the permanent magnet has strength 0.40 mT. The peak current in the coil is 0.45 mA Ba, Identity, on the diagram, the direction of the force on the coil with the [2 marks) current directions shown. Bb. Calculate the maximum magnetic force acting on the coil. [3 marks]
8c. Explain, with reference to electromagnetic induction, the effect of the motion of the coil on the current. [3 marks)
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