Electricity
Q & A
Q1: What type of charge does an ebonite rod acquire when it is rubbed with wool? What is
the nature of the charge acquired by wool?
Answer: Ebonite rod has a negative charge and woollen cap has an equal amount of positive charge.
Note: Charging by friction always produces equal and opposite charges on the twobodies which are rubbed in intimate contact.
Q2: What is the charge on an electron (e)?
Answer: -1.6 x 10 -19 Coulombs (C)
Q3: Define Coulomb's law.
Answer: The magnitude of the force of attraction (or repulsion) between two point charges is
directly proportional to the quantity of charge present on each of them and inversely
proportional to the square of the distance separating them.
Let q1 and q2 be two like charges separated by a distance d, then the two charges will continue to repel each other with a force (F). Mathematically it is represented as:
Q4: What is the SI unit of charge? Is it a scalar or vector quantity?
Answer: SI unit of charge is Coulomb (C). It is a scalar quantity.