The lesser electric ray (Narcine bancroftii) maintains an incredible charge on its head and a charge equal in magnitude but opposite in sign on its tail (Figure 19.30). 

(a) Sketch the equipotential lines surrounding the ray.

(b) Sketch the equipotentials when the ray is near a ship with a conducting surface. 

(c) How could this charge distribution be of use to the ray?

Transcribed Image Text:

50