1[C]) You charge up a copper ball and wait a short time, allowing the ball to re

Question

1[C]) You charge up a copper ball and wait a short time, allowing the ball to reach electrostatic equilibrium. Which combination of statements is most accurate?

(A) The electric field within the ball is constant
(B) The electric field within the ball is zero
(C) The electric field within the ball is not constant
(D) The voltage on the ball's surface is constant
(E) The voltage throughout the ball is constant
(F) There is a voltage difference between different points on the ball's surface
(G) There is a voltage difference between the center of the ball and its surface
(H) The voltage in the space outside of the ball is constant
(I) There is a voltage difference between the center of the ball and a point far away from the ball
(J) There is no voltage difference between the surface of the ball and a point a few centimeters away from the ball's surface

Correct, computer gets: ABDEI

2[C]) You bring an uncharged, identically shaped copper ball close to the first one (without touching them to each other). Which combination of statements is most accurate?

(A) The equipotential surface between the copper balls is spherical
(B) The equipotential surface between the copper balls is not spherical
(C) There are no equipotential surfaces in the space around the balls
(D) The physical surfaces of the copper balls are equipotential surfaces
(E) The physical surfaces of the copper balls are not equipotential surfaces
(F) There is a voltage difference between the surfaces of the copper balls
(G) There is no voltage difference between the surfaces of the copper balls
(H) A voltage difference is induced across the surface of the new copper ball

3[C]) You observe a charged particle accelerate across a vacuum chamber from lower voltage to higher voltage. Which combination of statements are the most accurate conclusions you can draw?

(A) The particle is neutral
(B) The particle is positively charged
(C) The particle is negatively charged
(D) The particle is charged, but the sign is unknown
(E) The particle's potential energy increased
(F) The particle's potential energy decreased
(G) The particle's potential energy remained unchanged
(H) The particle was accelerated along the direction of the electric field
(I) The particle was accelerated opposite the direction of the electric field
(J) There is no electric field across the vacuum chamber
(K) There may not be an electric field across the vacuum chamber

Explanation / Answer

Here ,

after equilibrium is reached for the copper ball

all the charge on the ball will be uniformly distributed on the surface of ball

the correct statements are

(A) The electric field within the ball is constant
(B) The electric field within the ball is zero
(D) The voltage on the ball's surface is constant
(E) The voltage throughout the ball is constant
(I) There is a voltage difference between the center of the ball and a point far away from the ball

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Now, if an uncharged copper ball is brought close

(A) The equipotential surface between the copper balls is spherical

(D) The physical surfaces of the copper balls are equipotential surfaces

(F) There is a voltage difference between the surfaces of the copper balls

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