Suppose you are building a King-Arthur-themed amusement park. You have constructed a stone with a hole in it, and a sword that fits in the hole.

Suppose you are building a King-Arthur-themed amusement park. You have constructed a stone with a hole in it, and a sword that fits in the hole. You have built a circuit into the sword and stone so that, when the circuit is switched on, the tip of the sword has a charge Q on it, and the bottom of the hole has a charge Q on it. (Don't worry about how one would build such a circuit - we'll get there later in the course.) With the sword in the hole, the two charges are separated by a distance d= 5cm. Estimate how large the charge Q must be so that even the strongest amusement park visitor will not be able to draw the sword from the stone (while the circuit is switched on.)

Important: Some estimation is required - you will need to justify your estimate.