Name: Fuse, Earthing and Power Rating
Uploaded: 2019-07-19
Duration: 7 min 12 s
Description: You must have noticed the power ratings in every electrical appliance in your home. What does it mean? You might wonder if I tell you that every appliance ha...

Question

State the sign of the charge acquired by an object when it is charged, by a positively charged rod, through (a) conduction (b) induction. Give the reason for your statement.

Accepted Answer

(a) Conduction:
When an object is charged by conduction with a positively charged rod, the object acquires a positive charge.

Reason: During conduction, the positively charged rod is brought into direct contact with the object. Electrons, which are negatively charged particles, flow from the object to the rod. As a result, the object loses some of its negative charges (electrons) and gains some positive charges. This transfer of electrons from the object to the rod leaves the object with a deficit of electrons, resulting in a net positive charge on the object.

(b) Induction:
When an object is charged by induction with a positively charged rod, the object acquires a charge that is opposite to that of the rod, so it acquires a negative charge.

Reason: During induction, the positively charged rod is brought close to but not in direct contact with the object. As the positively charged rod is brought near the object, the positive charges in the rod repel the electrons in the object, causing a redistribution of charges on the surface of the object. Electrons move within the object, and the side of the object closest to the positively charged rod becomes negatively charged, while the side farthest from the rod becomes positively charged. The net effect is that the side of the object facing the positively charged rod acquires a negative charge, while the other side acquires a positive charge.

The conduction involves direct contact with the charged rod, resulting in a transfer of charges and the same sign as the rod, while induction involves bringing the charged rod close to the object, causing a redistribution of charges and resulting in an opposite charge to that of the rod.

State the sign of the charge acquired by an object when it is charged, by a positively charged rod, through (a) conduction (b) induction. Give the reason for your statement.

Important Questions on Electric Charges at Rest

Learn and Prepare for any exam you want !