Question 1a

Marks: 4

(a)

Define the terms:

(i)

Gravitational field

[2]

(ii)

Electrostatic field

[2]

Question 1b

Marks: 2

An equation to describe field strength is:

$f i e l d s t r e n g t h = \frac{X}{Y}$

(b)

Define X and Y in the equation above.

[2]

Question 1c

Marks: 2

(c)

Based on your answer to part (b), define the terms in the following equations:

(i)

g = \frac{F}{m}

[1]

(ii)

E = \frac{F}{Q}

[1]

Question 1d

Marks: 3

The following text is about uniform electrostatic and gravitational fields.

(d)

Complete the following sentences by circling the correct words:

A gravitational field is a region of space in which objects with mass / charge will experience a force.

The direction of the gravitational field is always directed away from / towards the centre of the mass.

Gravitational forces are always attractive / repulsive and cannot be attractive / repulsive.

An electric field is a region of space in which objects with mass / charge will experience a force.

The electric field strength is a vector quantity, it is always directed away from / towards a positive charge and away from / towards a negative charge.

Opposite charges (positive and negative) repel / attract each other and like charges (positive-positive or negative-negative) repel / attract each other.

[6]

Question 2a

Marks: 3

(a)

Draw the electric field lines around the positive and negative point charges below.

[3

Question 2b

Marks: 3

The diagram shows two parallel plates of opposite charge.

10-1-ib-hl-sqs-easy-q4b-question10-1-ib-hl-sqs-easy-q4b-question

(b)

Draw the electric field lines between the two plates.

[3]

Question 2c

Marks: 5

Electrostatic fields can be radial or uniform.

(c)

State the defining features of the equipotentials for:

(i)

A radial field

[2]

(ii)

A uniform field

[3]

Question 2d

Marks: 4

(d)

(i)

On the diagram from part (a), draw the equipotential lines.

[2]

(ii)

On the diagram from part (b), draw the equipotential lines.

[2]

Question 3a

Marks: 2

(a)

State the definition for the gravitational potential at a point.

[2]

Question 3b

Marks: 2

(b)

Explain why gravitational potential is always negative.

[2]

Question 3c

Marks: 3

A satellite orbiting the moon, M, is moved from orbit A to orbit B:

10-1-ib-hl-sqs-easy-q5c-question

The gravitational potential due to the moon of each of these orbits is:

Orbit A: –2.10 MJ kg^–1
Orbit B: –1.65 MJ kg^–1

(c)

Calculate the gravitational potential difference as the satellite moves from orbit A to orbit B.

[3]

Question 3d

Marks: 2

The satellite has a mass of 950 kg.

(d)

Calculate the work done in moving the satellite from orbit A to orbit B.

[2]

Question 4a

Marks: 2

The diagram shows the electric field lines of a charged conducting sphere of radius r and charge q.

10-1-ib-hl-sqs-easy-q1a-question

(a)

State and explain the charge on the conducting sphere.

[2]

Question 4b

Marks: 2

Two points A and B are located on the same field line.

10-1-ib-hl-sqs-easy-q1b-question

(b)

Explain why electric potential decreases from A to B.

[2]

Question 4c

Marks: 3

A proton is placed at A and released from rest. The magnitude of the work done by the electric field in moving the proton from A to B is 2.5 × 10⁻¹⁶ J. Point A is at a distance of 0.1 m from the centre of the sphere and point B is at a distance of 0.5 m.

(c)

Calculate the electric potential between points A and B.

[3]

Question 4d

Marks: 1

(d)

The concept of potential is also used in the context of gravitational fields. Suggest why scientists describe different types of fields using the same terminology.

[1]

Question 5a

Marks: 2

The gravitational potential, $V_{g}$ around a planet can be calculated using the equation:

$V_{g} = - \frac{G m}{r}$

Where G is the gravitational constant, m is the mass of the planet and r is the distance from the centre of the planet.

The mass of the Earth is 5.97 × 10²⁴ kg.

(a)

Calculate the gravitational potential at a point 4.23 × 10⁷ m from the centre of the Earth.

[2]

Question 5b

Marks: 3

The gravitational potential on the surface of the Earth is –6.25 × 10⁷ J kg^–1.

(b)

Calculate the gravitational potential difference between the surface of the Earth and a point 4.23 × 10⁷ m from the centre of the Earth from part (a).

[3]

Question 5c

Marks: 2

(c)

Calculate the work done in taking a 5.0 kg mass from the surface of the Earth to a point 4.23 × 10⁷ m from the centre of the Earth.

[2]

Question 5d

Marks: 6

(d)

(i)

State the magnitude of the gravitational potential at a point where the Earth’s gravitational effect is negligible.

[1]

(ii)

Calculate the gravitational potential difference between the Earth’s surface (from part b) and the point where the Earth’s gravitational effect is negligible

[3]

(iii)

Calculate the work done in taking the 5.0 kg mass from the surface of the Earth to the point where the Earth’s gravitational effect is negligible.

[2]

DP IB Physics: HL

Topic Questions

10.1 Describing Fields

Question 1a

Question 1b

Question 1c

Question 1d

Question 2a

Question 2b

Question 2c

Question 2d

Question 3a

Question 3b

Question 3c

Question 3d

Question 4a

Question 4b

Question 4c

Question 4d

Question 5a

Question 5b

Question 5c

Question 5d

Resources

Members

Company

Quick Links