Electricity and Magnetism > Capacitance > Capacitors DCS# 5C20.60

DISPLACEMENT CURRENT

set-up for displacement current


APPARATUS
variable parallel plate capacitor 202-18-A
function generator 214-01-
oscilloscope with camera 202-cart
search coil 202-20
shielded cables 101-07-E


DESCRIPTION
Set the function generator to about 25 kHz.  Use the coil to probe the magnetic field between plates.   When the coil is placed between the capacitor plates with its plane perpendicular to the magnetic field an induced emf is observed, similar to that seen if the coil is placed next to the connecting wires.  

NOTES

At high frequencies, capacitive coupling between the coil and the capacitor plate produces a signal even in the wrong orientation.
REFERENCE
AJP 42(3),246