Electric Field & Current Of Electricity

Question 1

Coulomb’s law

Answer 1

Coulomb’s Law states that the electric force between two point charges is directly proportional to the product of their charges and inversely proportional to the square of their separation.

Question 2

Electric field

Answer 2

An electric field E is said to exist at a region in space if a small charge q placed in it experiences an electric force.

Question 3

Electric field strength

Answer 3

The electric field strength at a point is defined as the electric force per unit positive charge placed at that point.

Question 4

Electric potential

Answer 4

The electric potential at a point is defined as the work done per unit positive charge by an external agent in bringing a small test charge from infinity to that point.

Question 5

Electric potential energy

Answer 5

The electric potential energy at a point is defined as the work done by an external agent in bringing a small test charge from infinity to that point.

Question 6

Equipotential surfaces

Answer 6

Equipotential surfaces are surfaces on which the potential is the same at all points.

Question 7

Charge

Answer 7

Charge is the property of a particle that causes an interaction of the particle with other charged particles and material of electrical nature.

Question 8

Electric current

Answer 8

Electric current I is the rate of flow of charge.

Question 9

Electromotive force (emf) 👍

Answer 9

EMF of a source is defined as the amount of energy converted from other forms into electrical energy per unit charge passing through it.

Question 10

Potential difference

Answer 10

Potential difference (p.d.) across a conductor or between two points in a circuit is defined as the amount of electrical energy converted to other forms of energy per unit charge passing through it or across the two points.

Question 11

One volt

Answer 11

One volt is defined as the p.d. across a conductor or between two points in a circuit if one joule of electrical energy is converted to other forms of energy per coulomb of charge passing through it or across the two points

Question 12

Resistance

Answer 12

Electrical resistance of a conductor is defined as the ratio of the potential difference across the conductor to the current flowing through the conductor.

Question 13

One ohm

Answer 13

One ohm is defined as the resistance of a conductor when the potential difference across the conductor is one volt per ampere of current flowing through it.

Question 14

Resistivity of a material 👍

Answer 14

Resistance between opposite faces of a cubic conductor of unit length and unit cross-sectional area

Question 15

Ohm’s law 👍

Answer 15

For a metal conductor at constant temperature, the current is directly proportional to the applied pd.