The experiment apparatus consists of a coil at the end of a pendulum arm, swinging through a region with a magnetic field. Digital sensors connected to a computer allow measurement of the rotational motion of the pendulum, the induced emf across the coil, and the magnetic field strength at the coil’s location.
Briefly explain why the peak voltage across the coil decreases as the coil continues to swing. Make sure to mention any relevant properties of the pendulum (period, angular velocity, etc.) as well as the relevant quantities in Faraday’s Law (e.g. magnetic flux, magnetic field, area).
As the coil moves through the magnetic field, the angular velocity is not constant because of the change in the force component of the gravity as it swings to and fro. Due to this change in the angular speed, the rate of change of magnetic flux is not constant. Hence, the induced emf keeps on changing as the pendulum swings to and fro. The emf induced is based on the Lenz's law based on faraday's concept. It states that the induced emf will be such that it opposes the change in the magnetic flux. Hence, voltage will keep on changing i.e. reaching the peak and then decreases as the angular speed decreases as the magnetic force will slows the pendulum down.
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