At a particular moment, the magnetic field from the primary coil points to the right and is
Question:
At a particular moment, the magnetic field from the primary coil points to the right and is increasing in strength. The field due to the induced current in the secondary coil is
A. To the right.
B. To the left.
C. Zero.
Researchers are working on ways to circumvent the need for a direct electrical connection for power, and they are experiencing some success. Recently, investigators were able to use current flowing through a primary coil to power a \(60 \mathrm{~W}\) lightbulb connected to a secondary coil \(2.0 \mathrm{~m}\) away, with approximately \(15 \%\) efficiency. The coils were large and the efficiency low, but it's a start.
The wireless power transfer system is outlined in Figure VI.2. An AC supply generates a current through the primary coil, creating a varying magnetic field. This field induces a current in the secondary coil, which is connected to a resistance (the lightbulb) and a capacitor that sets the resonance frequency of the secondary circuit to match the frequency of the primary circuit.
Step by Step Answer:
College Physics A Strategic Approach
ISBN: 9780321907240
3rd Edition
Authors: Randall D. Knight, Brian Jones, Stuart Field