Feynman’s Paradox: Two charged balls are attached to a horizontal ring that can rotate about a vertical axis without friction. A solenoid with current I is on the axis. Initially, everything is at rest.

The current in the solenoid is turned off. What is the direction of the induced E when viewed from the top?

  1. 0
  2. CW.
  3. CCW.
Feynman’s Paradox: Two charged balls are attached to a horizontal ring that can rotate about a vertical axis without friction. A solenoid with current I is on the axis. Initially, everything is at rest. The current in the solenoid is turned off. What is the direction of the induced \mathbf{E} when viewed from the top? 0 CW. CCW. Correct Answer: B