Different Methods of Charging

Let $A$ and $B$ are two identical objects of same mass initially are charged electro statically by rubbing against each other. Let $A$ has got a positive charge and $B$ has got a negative charge, then match column I and column II.

Which method involves the process in which an object is charged without actually touching the object to any other charged object - charging by conduction or charging by induction?

Name the method of charging in which a neutral body is charged by the charged body by direct contact. (Choose from charging by induction or charging by conduction).

Charging by _____ is method by which a neutral body is charged by the charged body by direct contact.

Charging by _____ is a method by which an object is charged without actually touching the object to any other charged object.

The electric charge generated by induction stays only as long as the charged object is near to it. 

An experiment conducted to generate frictional electricity should be done in humid climate.

Static electricity remains on an object for a long duration.

Which of the following material cannot be charged easily by friction?

In the figure given below, which of the following could be referred to as A?

Which of the following materials can be used to check the flow of electric current?

The electrical charges produced by rubbing are called _____ charges.

Which of the following device is used to check whether a body is charged or not?

On rubbing an ebonite rod with fur it gets negatively charged, why? 

Let $A$ and $B$ are two identical objects of same mass initially are charged electro statically by rubbing against each other. Let $A$ has got a positive charge and $B$ has got a negative charge, then match column I and column II.

Look at the Figure, there are two metal spheres A and B touching each other. A charging rod is brought near the sphere A. What will be the nature of charge acquired by sphere A and sphere B after the process is complete? 

Describe how a body can be charged by: 

Conduction 

Describe how a body can be charged by: 
Induction 
 

Cotyledons are also called-

Five Styrofoam balls are suspended from insulating threads. Several experiments are performed on the balls and the following observations are made -

(i) Ball A repels C and attracts B

(ii) Ball D attracts B and has no effect on E

(iii) A negatively charged rod attracts both A and E.

An electrically neutral Styrofoam ball gets attracted if placed nearby a charged body due to induced charge. What are the charges, if any, on each ball