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Chapter 14: Q17Q (page 579)

Criticize the following statement: “When you rub your finger along the slick side of a U tape, the excess charges flow onto your finger, and this discharges the tape.” Draw diagrams illustrating a more plausible explanation.

Short Answer

Expert verified

The given statement is not correct.

Step by step solution

01

Neutrality of the atom

If the number of positive chargesin an atom is equal to the number of negative charges that exist in the same atom, then the atom is said to be electrically neutral.

The mobile charges are present on human skin that are positive in nature, and the U tape is negatively charged.

02

Determine whether the given statement is right or wrong

When you rub the finger along the slick side of U tape, the positive ions from your skin will be attracted to the negatively charged U tape, and this positive ion will be deposited on the slick surface of the U tape. Therefore, the U tape will become neutral. Therefore, the excess charge does not flow onto your finger.

Hence the given statement is wrong.

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Most popular questions from this chapter

9 Carbon tetrachloride (CCl4) is a liquid whose molecules are symmetrical and so are not permanent dipoles, unlike water molecules. Explain briefly how the effect of an external charge on a beaker of water (H2O) differs from its effect on a beaker of CCl4. (Hint: Consider the behavior of the permanent dipole you made out of U and L tapes.)

This question focuses on reasoning about equilibrium inside the nickel block shown in Figure 14.92. Start with these premises:

  • The definition of equilibrium inside a conductor and
  • The relationship between average drift speed and electric field

in a conductor to reason about which situations are possibleinside the nickel block at equilibrium. Some of the situations listed below are possible, some are ruled out by one premise, and some are ruled out by two premises. If a situation is ruled out by two premises, choose both.

Case 1:\({\bf{\bar v = 0}}\)and \({{\bf{E}}_{{\bf{net}}}}{\bf{ = 0}}\) (1) Possible, (2) Not possible by definition of equilibrium, (3) Not possible because \({\bf{\bar v = u}}{{\bf{E}}_{{\bf{net}}}}\)

Case 2:\({\bf{\bar v = 0}}\)and \({{\bf{E}}_{{\bf{net}}}}{\bf{ > 0}}\) (1) Possible, (2) Not possible by definition of equilibrium, (3) Not possible because \({\bf{\bar v = u}}{{\bf{E}}_{{\bf{net}}}}\)

Case 3:\({\bf{\bar v > 0}}\)and \({{\bf{E}}_{{\bf{net}}}}{\bf{ = 0}}\) (1) Possible, (2) Not possible by definition of equilibrium, (3) Not possible because \({\bf{\bar v = u}}{{\bf{E}}_{{\bf{net}}}}\)

Case 4:\({\bf{\bar v > 0}}\)and \({{\bf{E}}_{{\bf{net}}}}{\bf{ > 0}}\) (1) Possible, (2) Not possible by definition of equilibrium, (3) Not possible because \({\bf{\bar v = u}}{{\bf{E}}_{{\bf{net}}}}\)

Now that you have considered each case, in equilibrium, which one is the only situation that is physically possible? (1) Case 1, (2) Case 2, (3) Case 3, (4) Case 4

A large positive charge pulls on a distant electron. How does the net force on the electron change if a slab of glass is inserted between the large positive charge and the electron? Does the net force get bigger, smaller, or stay the same? Explain, using only labeled diagrams. (Be sure to show all the forces on the electron before determining the net force on the electron, not just the force exerted by the large positive charge. Remember that the part of the net force on the electron contributed by the large positive charge does not change when the glass is inserted: the electric interaction extends through matter.)

Can you charge a piece of plastic by induction? Explain, using diagram. Compare with the amount of charging obtained when you charge a piece of metal by induction.

You rub a plastic comb through your hair and it now carries a charge of -4×10-10C. What is the charge on your hair?
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