You observe that a negatively charged plastic pen repels a charged piece of magic tape. You then observe that the same piece of tape is repelled when brought near a small metal sphere. You are wearing rubber soled shoes, and you touch the metal sphere with your hand. After you touch the metal sphere, you observe that the tape is attracted to the metal sphere. Which of the following statements could be true. List all that apply. (1) Electrons from the sphere moved into the salt water on your skin, where they reacted with sodium ions. (2) The excess negative charge from the sphere spread out all over your body. (3) Chloride ions from the salt water on your hand moved onto the sphere. (4) Sodium ions from the salt water on your hand moved onto the sphere. (5) Electrons from your hand moved onto the sphere. (6) Electrons from the sphere traveled through your body into the Earth. (7) After you touched it, the metal sphere was very nearly neutral.

Question

Physics

Nico Berg

2 August, 07:57

You observe that a negatively charged plastic pen repels a charged piece of magic tape. You then observe that the same piece of tape is repelled when brought near a small metal sphere. You are wearing rubber soled shoes, and you touch the metal sphere with your hand. After you touch the metal sphere, you observe that the tape is attracted to the metal sphere. Which of the following statements could be true. List all that apply. (1) Electrons from the sphere moved into the salt water on your skin, where they reacted with sodium ions. (2) The excess negative charge from the sphere spread out all over your body. (3) Chloride ions from the salt water on your hand moved onto the sphere. (4) Sodium ions from the salt water on your hand moved onto the sphere. (5) Electrons from your hand moved onto the sphere. (6) Electrons from the sphere traveled through your body into the Earth. (7) After you touched it, the metal sphere was very nearly neutral.

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Answers (1)

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Troy Lam · Answer 1

(2) The excess negative charge from the sphere spread out all over your body.

(7) After you touched it, the metal sphere was very nearly neutral.

Explanation:

Plastic pen repels magic tape so magic tape is also negatively charged. Further, magic tape repels small metal sphere that means small sphere also is negatively charged.

Now when small sphere is touched by a man insulated from ground, the charge is distributed between man and small sphere according to their capacitance.

Since human body will have greater capacitance, it will acquire larger share of charge. Sphere being of very small size will retain very less charge and it will become almost neutral. Hence it will be attracted by charged tape.