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Form 1 Physics: Electrostatics I Questions and Answers
State the law of electrostatic charges.
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Answer Text:
Like charges repel and unlike charges attract.
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1.
You are provided with a charged electroscope, an insulator and a conductor. Describe how you would use these apparatus to distinguish the insulator from the conductor.
2.
State the law of electrostatic charges.
3.
A highly negatively charged rod is gradually brought close to the cap of a positively charged electroscope. It is observed that the leaf collapses initially and then diverges. Explain the observation.
4.
A positively charged rod is brought near the cap of a leaf electroscope. The cap is then earthed momentarily by touching with the finger. Finally the rod is withdrawn. The electroscope is found to be negatively charged. Explain how this charge is acquired.
5.
The figure below shows a highly negatively charged rod being brought slowly near the cap of a positively charged leaf electroscope. It is observed that the leaf initially falls and then rises. Explain this observation.
6.
The figure below shows three spherical balls of the same size placed on insulating stands. Balls A and B are conductors while ball C is nonconductor. Ball A was initially charged as shown. The quantity of charge is represented by the number of dashes. Ball A is made to touch B momentarily and then C. Show on Figure 6(b), the final distribution of charge on the balls.
7.
A leaf electroscope A is charged and placed on the bench. Another uncharged leaf electroscope B is placed on the same bench and moved close to A until the caps touch. State and explain what is observed on the leaves of A and B.
8.
The figure below shows two spherical materials one an insulator, the other a conductor. Negative charges are introduced at point A in each case. On the same figure indicate the final position of the charges. Explain your answer.
9.
A positively charged sphere is suspended by an insulating thread. A negatively charged conductor is suspended near it. The conductor is first attracted, after touching the sphere it is repelled. Explain this observation.
10.
A conductor is slowly brought near the cap of a positively charged electroscope. The leaf first collapses and then diverges. State the charge on the conductor.
11.
State two uses of a charged gold leaf electroscope.
12.
The figure below shows two identical pith balls A and B suspended with insulated threads. They are separated by an insulator X. A is positively charged and B is negatively charged. The quantity of charge on A is three times the quantity of charge on B. Sketch the final position of the pith balls after the insulator is removed.
13.
The figure below shows a negatively charged rod placed near an uncharged conductor resting on an insulating support. i). show the change distribution on the conductor. (ii) State the effect: (I) Of momentarily touching the conductor with a finger while the charged rod is still near the conductor. (II) On the charge distribution of withdrawing the negatively charged rod after momentarily touching
14.
It is observed that when a charged body is brought near the cap of a positively charged electroscope, the divergence of leaf increases. State the type of charge on the body.
15.
State the reason why an increase in leaf divergence is the only sure way of determining whether an object is negatively charged using a negatively charged electroscope.
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