Question

A pair of closely spaced parallel conducting plates, charged with equal and opposite electric charges, produces a uniform electric field in the region between them. in designing a cutting‑edge device that will revolutionize the electronics industry, leticia sets up such a pair of plates separated by a distance 0.879 mm, then charges them so that the direction of the electric field in their interior region points from plate A to plate B. Her idea requires that electrons, when released from rest at one of the plates, reach the other plate at the speed of 1.97% of the speed of light. the speed of light is c = 3.00 x 10^8 m/s.

1. At which plate should the electrons be released?
O A
O B
O Either
O Cannot be determined

Answer 1

Plate B

Step-by-step explanation:

Since the electric field is in the direction from plate A to plate B, this means plate A is the positive plate and plate B is the negative plate. The electron will flow in opposite direction to the direction of the electric field, meaning electrons will be released at B and accelerated toward plate A due to the attraction of the positive plate A on the negatively charged electron.

Answer 2

Plate B.

Step-by-step explanation:

If the direction of the electric field is from plate A to plate B, then this means that plate A is positively charged and plate B is negatively charged. If we are to move an electron between the plates, then we should place the electron on plate B, so the negatively charged electron can be attracted by the positive charges on plate A.