Define electric field .

An electric field is a region of space in which an electric charge experiences a force. Using a positive test charge convention, the field is directed away from a positive charge and towards a negative charge.

A positive charge is placed in an electric field of strength E . In which direction does it experience a force?

In the same direction as the field.

A negative charge is placed in an electric field of strength E . In which direction does it experience a force?

In the direction opposite to the field.

True or False? Electric field strength is a scalar quantity.

False. Electric field strength is a vector quantity — its direction is defined as the direction a small positive test charge would move if placed in the field.

The direction of an electric field is defined using the direction of the force on a small .......... test charge.

The direction of an electric field is defined using the direction of the force on a small positive test charge.

Define a uniform electric field.

A uniform electric field is one where the field lines are equally spaced at all points, the field strength is constant , and a test charge experiences a force of the same magnitude and direction everywhere in the field.

In a radial electric field, how does the electric field strength vary with distance from the charge?

It decreases with distance, as the field lines become further apart.

What feature of a field line diagram indicates where the electric field is strongest?

The region where the field lines are closest together .

Describe the electric field around a charged conducting sphere.

It is the same as the field around a point charge with all the charge concentrated at the sphere's centre . Field lines are always perpendicular to the sphere's surface.

Where is the neutral point between two point charges of the same type, and what defines it?

It lies at the midpoint between the two charges, where the resultant electric force is zero .

True or False? Field lines between two opposite point charges connect the surfaces of the two charges.

True. Attraction between opposite charges is represented by field lines running from the positive to the negative charge, connecting the surfaces of the two charges.

Electric field lines are always directed from the .......... charge to the negative charge.

Electric field lines are always directed from the positive charge to the negative charge.

A LevelPhysicsCambridge (CIE)Flashcards18. Electric FieldsElectric Fields & Field Lines

Electric Fields & Field Lines (Cambridge (CIE) A Level Physics): Flashcards

Exam code: 9702

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Define electric field.

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Cards in this collection (14)

Define electric field.
An electric field is a region of space in which an electric charge experiences a force. Using a positive test charge convention, the field is directed away from a positive charge and towards a negative charge.
Define electric field strength.
Electric field strength at a point is the force per unit charge experienced by a small stationary positive test charge placed at that point: $E = \frac{F}{q}$
Write the equation linking electric force F, charge q, and electric field strength E.
$F = q E$
A positive charge is placed in an electric field of strength E. In which direction does it experience a force?
In the same direction as the field.
A negative charge is placed in an electric field of strength E. In which direction does it experience a force?
In the direction opposite to the field.
True or False?
Electric field strength is a scalar quantity.
False.
Electric field strength is a vector quantity — its direction is defined as the direction a small positive test charge would move if placed in the field.
The direction of an electric field is defined using the direction of the force on a small .......... test charge.
The direction of an electric field is defined using the direction of the force on a small positive test charge.
Define a uniform electric field.
A uniform electric field is one where the field lines are equally spaced at all points, the field strength is constant, and a test charge experiences a force of the same magnitude and direction everywhere in the field.
In a radial electric field, how does the electric field strength vary with distance from the charge?
It decreases with distance, as the field lines become further apart.
What feature of a field line diagram indicates where the electric field is strongest?
The region where the field lines are closest together.
Describe the electric field around a charged conducting sphere.
It is the same as the field around a point charge with all the charge concentrated at the sphere's centre. Field lines are always perpendicular to the sphere's surface.
Where is the neutral point between two point charges of the same type, and what defines it?
It lies at the midpoint between the two charges, where the resultant electric force is zero.
True or False?
Field lines between two opposite point charges connect the surfaces of the two charges.
True.
Attraction between opposite charges is represented by field lines running from the positive to the negative charge, connecting the surfaces of the two charges.
Electric field lines are always directed from the .......... charge to the negative charge.
Electric field lines are always directed from the positive charge to the negative charge.

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