Question

A positively charged insulating rod is brought close to an object that is suspended by a string. If the object is attracted toward the rod we can conclude:

a. the object is positively charged
b. the object is negatively charged
c. the object is an insulator
d. the object is a conductor
e. none of the above

Answer 1

Answer: Option (b) is the correct answer.

Explanation:

It is known that opposite charges tend to attract each other whereas like charges tend to repel each other.

For example, when a positively charged insulating rod is brought close to an object and the object gets attracted towards the rod then it means that a negative charge is present on the object.

This is because both the object and rod gets attracted towards each other and only opposite charges tends to attract each other.

Thus, we can conclude that if the given object is attracted toward the rod we can conclude that the object is negatively charged.

Answer 2

Option (b) is the correct answer.  

In the case of electrostatic charges, the opposite charges attract each other, and like charges repel each other.

So, if there are two objects which are electrically charged and attract each other then the two must be oppositely charged, that is, if one is positively charged then the other must be negatively charged.

Hence, if the insulating rod is positively charged and the object is attracted towards it, then the object must be negatively charged

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