HW1Solutions

HW1Solutions - SOLUTIONS HW1 Q21-4 Atoms and molecules in the paper are polarized The electrons are pulled towards the rod the nuclei(protons

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
SOLUTIONS – HW1 Q21-4) Atoms and molecules in the paper are polarized: The electrons are pulled towards the rod, the nuclei (protons + neutrons) remain essentially where they are. In other words: the electron clouds are deformed. This makes the pieces of paper “more negative” on the side closer to the rod, and “more positive” on the opposite side. Q21-5) When rubbing the plastic ruler with a cloth, electrons are transferred from the cloth to the ruler, thus charging it negatively. Attraction occurs just as in Q21-4), only this time the electrons in the pieces of paper are repelled by the ruler and move away from it, thus leaving the positively charged nuclei closer to the ruler. On a humid day the air contains many water molecules. Water is polar, i.e. the charge on a water molecule is not uniformly distributed. Electrons on the ruler can be attracted to water molecules in the air and “leak off”, thus slowly de-charging the rod. Q21-13) Sometimes electrons from the ruler can jump onto the piece of paper, as they are attracted to the polarized molecules in the paper. As the paper was initially
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/07/2008 for the course PHY 113 taught by Professor Jordan during the Spring '08 term at Rochester.

Page1 / 2

HW1Solutions - SOLUTIONS HW1 Q21-4 Atoms and molecules in the paper are polarized The electrons are pulled towards the rod the nuclei(protons

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online