Question

State True or False:
Charges move in one object due to electric and magnetic fields produced in other objects. This type of charge production is done through charging by induction.
A. True
B. False

Answer 1

Hint: The charges are free to move in the conductors but they do not transfer from one object to another if there is no external force. Recall the process of charge transfer by charging by induction process. You will need negatively or positively charged non-conducting material for the charging by induction process.

Complete answer:
To answer this question, let’s discuss the process of charging by induction. We have two metal objects A and B out of which A is negatively charged and B is charged less. We have to place these objects on the insulating supporting stands so that the charge acquired by these objects does not flow towards the ground through the stand. Now, we place the two objects side by side. The negative charge from the charged object A will not travel through the object B unless there is force on the charges.

Now, let’s take a negatively charged balloon and bring it near the system of two objects. We know that the like charges repel each other. Therefore, the negative charges in the balloon will repel the negative charges in the object A towards the object B and there will be charge transfer from object A to object B. Due to mass migration of electrons from object A, the object A will attain a net positive charge and due to gain in the negative charge from object A, object B will attain the net negative charge. Once we separate the two objects, the negative charge on the object B will be uniformly distributed over the surface.

In this way, we have seen that the charges in the object A moved to the object B by induction process. Therefore, the given statement is true.

So, the correct answer is option A.

Note:Students should note that there is not the creation of negative charges on the object B but it is the transfer of negative charge from one object to another object. The charge can neither be created nor be destroyed. You can see there is charge conservation in the system of two objects even after the charging by induction. The net positive charge on the object A equals the net negative charge on the object B.