Definitions

Question 1

Capacitor

Answer 1

A pair of conducting plates separated by an insulator, if a potential difference is placed across the plates they acquire equal and opposite charges.

Question 2

Dielectric

Answer 2

Insulator between the plates of a capacitor, also serving to make the capacitance larger than if there were just empty space.

Question 3

Coulomb’s Law

Answer 3

The electrostatic force between two small bodies is proportional to the product of their charges, and inversely proportional to their separation squared.

Question 4

Newton’s Law of gravitation

Answer 4

The gravitational force between two particles is proportional to the product of their charges and inversely proportional to their separation squared.

Question 5

Electric field strength

Answer 5

The force experienced per unit charge by a small positive charge placed in the field.

Question 6

Gravitational field strength

Answer 6

The force experienced per unit mass by a mass placed in the field

Question 7

Electric potential

Answer 7

At a point is the work done per unit charge in bringing a positive charge from infinity to that point.

Question 8

Gravitational potential

Answer 8

At a point is the work done per mass in bringing a mass from infinity to that point

Question 9

Kepler’s First Law

Answer 9

Each planet moves in an ellipse with the sun at one focus

Question 10

Kepler’s Second Law

Answer 10

The line joining a planet to the center of the sun sweeps out equal areas in intervals of time

Question 11

Kepler’s Third Law

Answer 11

T^2, The square of the period of the planets motion, is proportional to r^3, in which r is the semi-major axis of its ellipse