AQA Physics A-level Section 7: Fields and their Consequences Notes

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What do electric field lines represent?

The direction of the force acting on a positive charge (correct)

The type of charge

The distance between two charges

The magnitude of electric force

In a uniform electric field, what is true about the electric force?

It varies across the field

It depends on the type of charge

It is strongest at the edges of the field

It is the same everywhere in the field (correct)

What happens when a charged particle is fired at right angles to a uniform electric field?

It slows down and changes direction randomly

It follows a linear path

It accelerates and follows a parabolic shape (correct)

It remains stationary

How can you calculate the work done by moving a charged particle in a uniform field?

$F \times d$ Signup and view all the answers

Which equation helps in calculating the electric field strength?

$F = EQ$ Signup and view all the answers

How are uniform and radial electric fields different in terms of force?

Uniform fields depend on distance between charges for force Signup and view all the answers

Which of the following statements about force fields is correct?

Force fields are formed during the interaction of masses, static charges, or moving charges. Signup and view all the answers

What type of field is formed during the interaction of charges?

Electric field Signup and view all the answers

Which of the following statements about gravitational fields is correct?

Gravitational fields are formed during the interaction of masses. Signup and view all the answers

How can the strength of a force field be represented in a field line diagram?

The distance between field lines represents the strength of the field. Signup and view all the answers

Which of the following forces follow an inverse-square law?

Gravitational force and electric force Signup and view all the answers

What is the main difference between gravitational fields and electric fields?

Gravitational fields are always attractive, while electric fields can be either attractive or repulsive. Signup and view all the answers

According to Coulomb's law, the force between two point charges is directly proportional to which of the following?

The product of their charges Signup and view all the answers

In Coulomb's law, if two charges have different signs, what type of force will be present between them?

Attractive Signup and view all the answers

Why are satellites that orbit quickly required to work together for constant coverage?

To maintain coverage as they orbit rapidly Signup and view all the answers

Which subatomic particle characteristic results in electrostatic forces being much greater than gravitational forces?

Charge being larger than mass Signup and view all the answers

When treating air as a vacuum in calculations, what assumption can be made for a charged sphere?

The charge acts at the center of the sphere Signup and view all the answers

What determines the strength of the force between two point charges in a vacuum according to Coulomb's law?

The distance squared between the charges Signup and view all the answers