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What are pith balls made from?

Important Questions on Electricity

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An electroscope is a device which is used to find if an object is 
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A positively charged rod is brought near a negatively charged electroscope. The leaves of the electroscope will 
 
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When an uncharged conductor is brought in contact with the disc of a gold leaf electroscope, its leaves _____.
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A glass rod rubbed with silk is touched with the disc of a negatively charged gold leaf electroscope. The divergence of leaves will
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If a plastic ruler is used to connect the disc of a charged electroscope A, with that of an uncharged electroscope B, the
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The gold leaves of an uncharged electroscope _____ each other, if a charged body is brought in contact with it.

(Choose from the following: repel/attract)

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An electroscope is an instrument used to
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An electroscope charged by induction using a charged ebonite rod becomes _____ charged.
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An electroscope can be used to _____.
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An electroscope can be used to detect the presence of _____. (charge/ current)
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A gold-leaf electroscope can 
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A gold-leaf electroscope can be used
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An electroscope can be used to test whether a body is a _____ or not.
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A gold-leaf electroscope is to be charged positively by conduction. For this
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In an electroscope, the aluminium leaves diverge because like charges _____ (converge/attract/repel) each other.
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The device used for detecting charge (positive or negative) on an object is called:
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When a charged body is kept in contact with the disc of an uncharged gold-leaf electroscope, the leaves will _____ (diverge/ move closer).
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If we move a charged object towards an electroscope, the aluminium strips are _____.
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The gold leaves of an uncharged electroscope _____ if a charged body is brought in contact with its brass disc. (Diverge/attract)
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An electroscope is a device which is used to find if an object is