%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520class%253D%2522c1%252

Question

%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520class%253D%2522c1%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c1%2522%250Axml%253Alang%253D%2522EN-US%2522%253EI%253C%252Fspan%253E%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520class%253D%2522c1%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c1%2522%250Axml%253Alang%253D%2522EN-US%2522%253E%253Cbr%2520%252F%253E%253C%252Fspan%253E%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520class%253D%2522c1%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c1%2522%250Axml%253Alang%253D%2522EN-US%2522%253E%253Cbr%2520%252F%253E%253C%252Fspan%253E%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520class%253D%2522c1%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c1%2522%250Axml%253Alang%253D%2522EN-US%2522%253Envestigation%2520A.%2520The%2520pith%2520ball%250AElectroscope%253C%252Fspan%253E%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c2%2522%2520xml%253Alang%253D%250A%2522EN-US%2522%253E%2520%2526nbsp%253B%2526nbsp%253B%2520%2526nbsp%253B%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2520c3%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c2%2522%2520xml%253Alang%253D%250A%2522EN-US%2522%253EThe%2520pith%2520ball%2520electroscope%2520consists%2520of%2520a%2520light%252C%2520conducting%250Apith%2520ball%2520suspended%2520from%2520a%2520support%2520by%2520means%2520of%2520an%2520insulating%250Astring.%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520class%253D%2522c1%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c1%2522%250Axml%253Alang%253D%2522EN-US%2522%253E%2526nbsp%253B%253C%252Fspan%253E%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520class%253D%2522c1%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c1%2522%250Axml%253Alang%253D%2522EN-US%2522%253E%2526nbsp%253B%253C%252Fspan%253E%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c2%2522%2520xml%253Alang%253D%250A%2522EN-US%2522%253EQ1.%2520%2526nbsp%253BA.%2520Ground%2520the%2520pith%2520ball%2520by%2520touching%250Ait.%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c2%2522%2520xml%253Alang%253D%250A%2522EN-US%2522%253E%2526nbsp%253B%2526nbsp%253B%2520%2526nbsp%253B%2526nbsp%253BB.%2520Rub%2520a%2520rubber%2520rod%2520with%2520wool%2520of%250Afur%2520and%2520bring%2520it%2520near%2520the%2520pith%2520ball%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c2%2522%2520xml%253Alang%253D%250A%2522EN-US%2522%253E%2526nbsp%253B%2526nbsp%253B%2526nbsp%253B%2526nbsp%253B%2520C.%2520Remove%2520the%2520rod%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c2%2522%2520xml%253Alang%253D%250A%2522EN-US%2522%253E%2526nbsp%253B%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c2%2522%2520xml%253Alang%253D%250A%2522EN-US%2522%253EQ2.%2526nbsp%253B%2520A.%2520Ground%2520the%2520pith%2520ball.%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c2%2522%2520xml%253Alang%253D%250A%2522EN-US%2522%253E%2526nbsp%253B%2526nbsp%253B%2526nbsp%253B%2526nbsp%253B%2520B.%2520Rub%2520a%2520glass%2520rod%2520with%2520silk%2520and%250Abring%2520it%2520near%2520the%2520pith%2520ball.%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c2%2522%2520xml%253Alang%253D%250A%2522EN-US%2522%253E%2526nbsp%253B%2526nbsp%253B%2526nbsp%253B%2526nbsp%253B%2520C.%2520Remove%2520the%2520rod%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c2%2522%2520xml%253Alang%253D%250A%2522EN-US%2522%253E%2526nbsp%253B%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c2%2522%2520xml%253Alang%253D%250A%2522EN-US%2522%253EQ3.%2526nbsp%253B%2520A.%2520Ground%2520the%2520pith%2520ball.%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c2%2522%2520xml%253Alang%253D%250A%2522EN-US%2522%253E%2526nbsp%253B%2526nbsp%253B%2526nbsp%253B%2526nbsp%253B%2520B.%2520Bring%2520a%2520negatively%2520charged%2520rod%250Anear%2520the%2520pith%2520ball.%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c2%2522%2520xml%253Alang%253D%250A%2522EN-US%2522%253E%2526nbsp%253B%2526nbsp%253B%2526nbsp%253B%2526nbsp%253B%2520C.%2520Touch%2520the%2520pith%2520ball%2520with%2520the%250Arod%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c2%2522%2520xml%253Alang%253D%250A%2522EN-US%2522%253E%2526nbsp%253B%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c2%2522%2520xml%253Alang%253D%250A%2522EN-US%2522%253EQ4.%2526nbsp%253B%2520A.%2520Charges%2520the%2520pith%2520ball%2520as%2520in%25203%252C%2520by%250Acontact.%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c2%2522%2520xml%253Alang%253D%250A%2522EN-US%2522%253E%2526nbsp%253B%2526nbsp%253B%2526nbsp%253B%2526nbsp%253B%2520B.%2520Bring%2520a%2520negatively%2520charged%2520rod%250Anear%2520the%2520pith%2520ball.%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c2%2522%2520xml%253Alang%253D%250A%2522EN-US%2522%253E%2526nbsp%253B%2526nbsp%253B%2526nbsp%253B%2526nbsp%253B%2520C.%2520Removes%2520the%2520rod.%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c2%2522%2520xml%253Alang%253D%250A%2522EN-US%2522%253E%2526nbsp%253B%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c2%2522%2520xml%253Alang%253D%250A%2522EN-US%2522%253EQ5.%2526nbsp%253B%2520A.%2526nbsp%253B%2520Charge%2520the%2520pith%2520ball%2520as%2520in%25203%252C%2520by%250Acontact.%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c2%2522%2520xml%253Alang%253D%250A%2522EN-US%2522%253E%2526nbsp%253B%2526nbsp%253B%2526nbsp%253B%2526nbsp%253B%2520B.%2526nbsp%253B%2520Bring%2520a%2520positively%250Acharged%2520rod%2520near%2520the%2520pith%2520ball.%253C%252Fspan%253E%253C%252Fp%253E%250A%253Cp%2520class%253D%2522MsoNormal%2522%253E%253Cspan%2520lang%253D%2522EN-US%2522%2520class%253D%2522c2%2522%2520xml%253Alang%253D%250A%2522EN-US%2522%253E%2526nbsp%253B%2526nbsp%253B%2526nbsp%253B%2526nbsp%253B%2520C.%2526nbsp%253B%2520Remove%2520the%250Arod.%253C%252Fspan%253E%253C%252Fp%253E%250A

Explanation / Answer

The pith ball electroscope consists of a light, conducting pith ball suspended from a support by means of an insulating string.

Q1. A. Ground the pith ball by touching it.

     B. Rub a rubber rod with wool of fur and bring it near the pith ball

     C. Remove the rod

Q2. A. Ground the pith ball.

     B. Rub a glass rod with silk and bring it near the pith ball.

     C. Remove the rod

Q3. A. Ground the pith ball.

     B. Bring a negatively charged rod near the pith ball.

     C. Touch the pith ball with the rod

Q4. A. Charges the pith ball as in 3, by contact.

     B. Bring a negatively charged rod near the pith ball.

     C. Removes the rod.

Q5. A. Charge the pith ball as in 3, by contact.

     B. Bring a positively charged rod near the pith ball.

     C. Remove the rod.

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