Flashcards in 10.1 Gravitational And Electrical Potential Deck (17)

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1

## What is gravitational potential at a point?

### The work done per unit mass to move a point mass from infinity to that point at a small constant speed V = W/m the unit of gravitational potential Jkg-1

2

## What is electric potential at a point?

### The work done per unit charge to move a positive point charge from infinity to that point at a small constant speed V = W/q the unit of gravitational potential JC-1

3

## What is an equipotential surface?

### A surface on which the potential is the same everywhere.

4

## What is the gravitational potential energy at a point?

### The work done to move a point mass from infinity to that point in a gravitational field.

5

## What is the electrical potential energy at a point?

### The work done to move a positive point charge from infinity to that point in an electrical field.

6

## What is gravitational potential?

### A scalar quantity, the work done in moving a mass in a gravitational field is independent of the path followed, the formula is V = -GM/r

7

## What is electrical potential?

### A scalar quantity, the work done in moving a positive point charge in an electric field is independent of the path followed, the formula is V = kQ/r

8

## How can you find gravitational or electrical potential from more than one mass or charge?

### Because potential is a scalar quantity we find potential from each mass or charge separately and add them.

9

## What is gravitational work?

###
To move a mass from one point to another in a gravitational field requires that work to be done. The work done on the mass is

W = mdeltaV.

10

## What is the formula for the world done by the gravitational force?

### W = -mdeltaV

11

## What is electrical work?

###
To move a charge from one point to another in an electrical field requires that work to be done. The work done on the mass is

W = qdeltaV.

12

## What is the formula for the world done by the electric force?

### W = -qdeltaV

13

## What is field strength?

### The negative gradient of the potential.

14

## On a graph of potential versus distance what is the gradient?

### The negative of the field strength.

15

## What is the formula for electric field strength?

### E = kQ/r^2

16

## What is the formula for gravitational field strength?

### g = GM/r^2

17