The next 3 questions refer to the figure on the right, which shows some equipote

Question

The next 3 questions refer to the figure on the right, which shows some equipotential contours. (The points "A" through "D" are simply points in empty space.) Neglect gravity. At which labeled point is the magnitude of the electric field the greatest? A) Point A B) Point B C) Point C D) Point D E) It's the same at B, C, and D (but greater than at A) An electron (charge -e) is released at point A. Which way will it A) It starts to accelerate straight down the page B) It starts to accelerate straight up the page C) It will not move anywhere D) It will begin to follow the contour line it is sitting on at steady speed. E) It will begin to accelerate around the contour line it is sitting on. An alpha particle (charge +2e) is moved from point D to point A by an external force. How much work did the external force do on the particle? A -6.4E-18 J B) +40 eV C) +5.8E-17 J D) -160 eV E) None of the above is correct

Explanation / Answer

3. Magnitude of electric field will be greater at point D

4. b it will starts to accelerate straight up in the direction of field.

5 W=qv = 2e (-100 -(-80)) = option A

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