Q.

What charge does a glass rod develops when rubbed with silk


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a

Positive

b

Negative

c

Neutral

d

All of the above 

answer is A.

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Detailed Solution

This is becausewhen the glass rod is rubbed with silk then the glass loses electrons and silk gains electrons. Therefore the glass rod becomes positively charged and silk becomes negatively charged. Hence, when a glass rod rubbed with silk then a positive charge develops.
  
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What charge does a glass rod develops when rubbed with silk