6. Use the electrostatic series to determine the charge on the following objects after being charged by friction: (4 marks) a) polyester rubbed with nylon b) wool rubbed with acetate c) silk rubbed with glass d) cotton rubbed with cotton

Here's how to determine the charges using the electrostatic series:<br /><br />**Understanding the Electrostatic Series:**<br /><br />The electrostatic series lists materials in order of their tendency to gain or lose electrons. A material will gain electrons (become negatively charged) when rubbed against a material lower on the list, and lose electrons (become positively charged) when rubbed against a material higher on the list.<br /><br />A typical electrostatic series (though the exact order can vary slightly) is:<br /><br />* (+) Glass<br />* Wool<br />* Silk<br />* Cotton<br />* Acetate<br />* Polyester<br />* (-) Nylon<br /><br /><br />**Applying the Series to the Questions:**<br /><br />a) **Polyester rubbed with nylon:** Polyester is higher on the list than nylon. Therefore, polyester will gain electrons and become **negatively charged**, while nylon will lose electrons and become **positively charged**.<br /><br />b) **Wool rubbed with acetate:** Wool is higher on the list than acetate. Therefore, wool will gain electrons and become **negatively charged**, while acetate will lose electrons and become **positively charged**.<br /><br />c) **Silk rubbed with glass:** Glass is higher on the list than silk. Therefore, glass will gain electrons and become **negatively charged**, while silk will lose electrons and become **positively charged**.<br /><br />d) **Cotton rubbed with cotton:** Since both materials are the same, there is no difference in their tendency to gain or lose electrons. Therefore, neither material will develop a charge. They will remain **neutral**.<br />