Electric Charges
The physical property of matter that causes it to experience a force when placed in an electromagnetic field is called electric charge. Electric charge is a characteristic that accompanies fundamental particles, wherever they exist. The process of charging a neutral body by bringing a charged body nearby it without making contact between the two bodies is known as charging by induction.
Figures given below are showing the sequential steps of charging a conductor permanently by using the process of charging by induction.
Which of the following method can be used to charge a metal sphere positively without touching it?
Options:
(a) Connect the positive terminal of battery and float the other end of battery.
(b) Rub it with a piece of fur.
(c) Bring a negatively charged rod near it and touch it to ground for some time.
(d) Rub it with a piece of silk.