D1-QRT08: CHARGED ROD NEAR ELECTROSCOPE-CHARGE A student first holds a positivel
ID: 1378194 • Letter: D
Question
D1-QRT08: CHARGED ROD NEAR ELECTROSCOPE-CHARGE A student first holds a positively charged rod near the top plate of an electroscope without touching it. The electroscope foil deflects. The electroscope was initially uncharged. (a) Is the electroscope now (i)positively charged. (ii) negatively charged, or neutral. Explain your reasoning. She then touches the electroscope plate while keeping the positively charged rod near the plate. The electroscope foil falls back to its undeflected position. (b) Is the electroscope (i) positively charged. (ii) negatively charged, or (iii) neutral. Explain your reasoning. While holding the positively charged rod stationary, she removes her hand which is touching the electroscope. Finally, she removes the charged rod. (C) Is the electroscope (i)positively charged, (ii) negatively charged, or (iii) uncharged. Explain your reasoning. (d) Will the electroscope foil be (i) deflected or (ii) undeflected? Explain your reasoning.Explanation / Answer
(a) Positively charged.
Bringing positively charged rod nearer to the top end of electroscope induces the negative charge at the top and positve charges at the leaves. Thus deflected and positively charged.
(b) Neutral
Making physical contact with the electroscope, all chaarges move into her through finger thus makes leaves neutral one and leaves undeflected to original position.
(c) Positively charged.
While touching the top of the electroscope removes all negatively charged particles from the top only not the positive charges in the leaves. And now removing positve rod at the top will not induce any changes and the leaves are still positively charged though some of the positive charges run to the top.
(d) deflected
Because the leaves contains positive charge.
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