Investigate under what conditions an induced current arises in a closed coil. Determine how its direction and magnitude change depending on the direction of magnet motion, the orientation of its poles, the speed of motion, and the magnetic field induction.
Studying the appearance of induced current during relative motion of the magnet and coil (Setup 1, left).
a. Grab the bar magnet (or the coil itself) with your mouse or finger and move it up and down. Observe the deflection of the milliammeter-galvanometer needle.
b. Leave the magnet and coil stationary relative to each other. Does induced current flow then?
c. Check the appearance of induced current with a stationary magnet by moving the coil up and down, and compare the needle deflection during slow and fast motion.
Dependence of the magnitude and direction of induced current on the magnetic field and magnet poles.
a. Check "Two Magnets (pair)" to form a double bar magnet system. Repeat inserting and removing the magnets in the coil and compare the maximum current.
b. Check "Rotate magnet by 180°" to reverse the magnet poles. Find out how the direction of needle deflection changes when the magnet enters and exits.
Studying induced current using two coils on a common iron core (Setup 2, right).
a. Close the circuit of the right setup using the "Close Circuit" button or by clicking the switch in the 3D scene.
b. Grab the upper coil with your mouse or finger and move it along the iron core up (removing from the core) and down (placing onto the core). Observe the right milliammeter needle.
c. Investigate how the speed of coil motion and the current in the primary circuit (adjusted by the rheostat slider from 0.2 A to 2.0 A) affect the magnitude of the induced current.
d. Also observe the milliammeter needle at the moments of closing/opening the switch and during rapid changes in rheostat resistance while the upper coil is stationary.