Choose one of the following (Positive, Negative, Neutral or Cannot tell) 1- A po
ID: 250562 • Letter: C
Question
Choose one of the following (Positive, Negative, Neutral or Cannot tell)
1- A positively charged ball is brought close to a neutral isolated conductor. The conductor is then grounded, while the ball is kept close. If the ball is first taken away and then the ground connection is removed, the conductor has a _______ charge.
2- positive negative neutral cannot tell A negatively charged glass rod repels an object suspended by a non-conducting thread. The charge on the object is _______ .
3- positive negative neutral cannot tell A positively charged glass rod attracts an object suspended by a non-conducting thread. The charge on the object is _______ .
4- positive negative neutral cannot tell A positive point charge is brought near the outside surface of a neutral conducting sphere and released. The initial position of the point charge is on the on the positive x axis and the sphere is centered on the origin. The point charge moves in the _______ x direction. (If the point charge does not move, select "Cannot tell".)
5- positive negative neutral cannot tell Two neutral metal spheres, #1 and #2, are mounted on insulating supports. They are connected by a wire. A positively charged glass rod is brought near sphere #1. The wire connecting the spheres is removed and the charged rod is then taken away. Now the charge on sphere #2 is _______ .
I choose:
1- negative, 2- negative, 3- negative, 4- neutral and 5- positive, but it kept saying wrong. I'm not sure which one is wrong but I guess it is the fourth one cause' it is confusing.
HELP ME PLEASE! THANKS IN ADVANCE :)
Explanation / Answer
1)
NEUTRAL - The positive ball induces negative charges to accumulate on the side of the isolated conductor closest to the ball, leaving unbalanced positive charges furthest from the ball. When you ground the ball the unbalanced positive charges result in further negative charges flowing from ground onto the conductor. If the charged ball is removed before the ball the negative charges redistribute so the conductor is once again neutral (the negative charges that flowed up from ground run back to ground.
2)
A negatively charged glass rod repels an object suspended by a non-conducting thread. The charge on the object is NEGATIVE.
3)
A negatively charged glass rod attracts an object suspended by a non-conducting thread. The charge on the object is POSITIVE
4)
cannot tell
5) POSITIVE -
Assuming the wire is a conductor, then "positive". Electrons should have been attracted to sphere 1, creating a positive charge on sphere 2 when the wire was removed. Had the rod been removed first, the spheres would have returned to neutral.