Electricity 1

Question 1

Electrical charge?

Answer 1

The atom, once thought to be the smallest particle, is
made up of three even smaller particles
* proton
* neutron
* electron

Question 2

MILLIKAN OIL-DROP?

Answer 2

This experiment measured the
elementary charge e of the electron
and demonstrated the quantised
nature of the electronic charge.

Question 3

The Atom?

Answer 3

When the number of electrons = the number of protons, the atom is neutrally
charged, i.e., there is no NET charge.

Question 4

Example of charging through contact

Answer 4

• A glass rod is rubbed with silk.
• Car body after running for while.

Question 5

CHARGING BY
INDUCTION?

Answer 5

We can also charge something just
by bringing a charged object close
to it.

Question 6

ELECTROSTATIC
INDUCTION?

Answer 6

A charged object.
* A conductive (or
metallic) object.
* In conductive
materials, electrons
can move around
easily.

Question 7

ELECTRIC FIELD AND FIELD DISTRIBUTION?

Answer 7

▪ Around every charge there is a field of forces.
▪ It is like the gravitational field as we learned in the previous lecture.

Question 8

ELECTRIC ENERGY STORAGE?

Answer 8

Electrical energy is stored in a capacitor, which consists of two conducting plates separated by a small distance without touching.

Question 9

ELECTRIC ENERGY STORAGE - BATTERIES?

Answer 9

The positive battery terminal pulls electrons from one plate, which are then pumped through the battery to the negative terminal and into the opposite plate.

Question 10

Coulomb’s law

Answer 10

Coulomb’s Law describes the electrostatic force between two charged particles.