Photo AI
Faraday’s law of electromagnetic induction - Leaving Cert Physics - Question d - 2014
Question d
Faraday’s law of electromagnetic induction. Describe an experiment to demonstrate Faraday’s law. A hollow copper pipe and a hollow glass pipe, with identical dimen... show full transcript
Worked Solution & Example Answer:Faraday’s law of electromagnetic induction - Leaving Cert Physics - Question d - 2014
Step 1
Step 2
Describe an experiment to demonstrate Faraday’s law
Answer
To demonstrate Faraday's law, a coil of wire is connected to a sensitive ammeter. A strong magnet is then moved towards or away from the coil. The ammeter will show a deflection indicating that current is induced in the coil, illustrating that a changing magnetic field induces an emf.
Step 3
Explain why the magnet took longer to fall through the copper pipe
Answer
As the magnet falls through the copper pipe, it creates a changing magnetic flux within the pipe, which induces an emf according to Faraday's law. This induced emf causes currents to flow in the copper, creating magnetic fields that oppose the motion of the falling magnet (Lenz's law). This opposition slows down the magnet, causing it to take longer to pass through the copper pipe compared to the glass pipe, where no such induced current occurs.