Three objects (A, B, and C) are all initially in contact. One (we don\'t initial

Question

Three objects (A, B, and C) are all initially in contact. One (we don't initially know which) is made of an insulating material. The other two are made of conducting material.

A positively charged rod is then touched to object A as shown.

The rod is then removed.

The three objects are then separated.

If the final net charge on object A is positive, the final net charge on B is positive, and the final net charge on C is zero, which object is made of an insulating material? (Note: These final net charges do not need to be uniformly distributed on the objects.)

A:Object C

B:All of the objects are made of insulating material.

C:Object A

D:Object B

E:None of the objects are made of insulating material.

-An explanation would be great!

Explanation / Answer

Here insulating material is that which prevents conduction of electricity or charge. And conducting material is that which allows conduction of charge through it.

When the rod is touched to object A charge conducts from the rod to the object A. Hence object A is made u of conducting material.

Since object B is in contact with object A , charge flows from A to B, hence object B is also made u of conducting material.

However, though object C is in contact with object B, it revent conduction of the charge into object C, hence object C is made up of insulating material.

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