State the direction of the electric field around an isolated point charge for both a positive charge and a negative charge.

Positive charge: field points away from the centre of the charge Negative charge: field points towards the centre of the charge

What is the electric field strength inside a uniformly charged conducting sphere?

Zero. The field strength is zero inside the sphere and decreases with distance outside it according to an inverse square law.

For a point on the same line as two point charges, if the individual fields act in opposite directions, the magnitude of the resultant field is equal to the .......... of the two field strengths.

For a point on the same line as two point charges, if the individual fields act in opposite directions, the magnitude of the resultant field is equal to the difference of the two field strengths.

How is the resultant electric field strength found at a point that forms a right-angled triangle with two point charges?

By vector addition of the two field components using Pythagoras' theorem .

True or False? The electric field strength due to a point charge is directly proportional to the distance from the charge.

False. Electric field strength is inversely proportional to the square of the distance from the charge (an inverse square law), not directly proportional to distance.

A LevelPhysicsCambridge (CIE)Flashcards18. Electric FieldsElectric Field of a Point Charge

Electric Field of a Point Charge (Cambridge (CIE) A Level Physics): Flashcards

Exam code: 9702

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FrontElectric Field Strength of a Point Charge
Define electric field strength due to a point charge.
FrontElectric Field Strength of a Point Charge
State the direction of the electric field around an isolated point charge for both a positive charge and a negative charge.
BackElectric Field Strength of a Point Charge
Positive charge: field points away from the centre of the charge
Negative charge: field points towards the centre of the charge

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Cards in this collection (6)

Define electric field strength due to a point charge.
$E = \frac{F}{q} = \frac{Q}{4 π ϵ_{0} r^{2}}$
The field is not constant and follows an inverse square law with distance r from the charge.
State the direction of the electric field around an isolated point charge for both a positive charge and a negative charge.
- Positive charge: field points away from the centre of the charge
- Negative charge: field points towards the centre of the charge
What is the electric field strength inside a uniformly charged conducting sphere?
Zero. The field strength is zero inside the sphere and decreases with distance outside it according to an inverse square law.
For a point on the same line as two point charges, if the individual fields act in opposite directions, the magnitude of the resultant field is equal to the .......... of the two field strengths.
For a point on the same line as two point charges, if the individual fields act in opposite directions, the magnitude of the resultant field is equal to the difference of the two field strengths.
How is the resultant electric field strength found at a point that forms a right-angled triangle with two point charges?
By vector addition of the two field components using Pythagoras' theorem.
True or False?
The electric field strength due to a point charge is directly proportional to the distance from the charge.
False.
Electric field strength is inversely proportional to the square of the distance from the charge (an inverse square law), not directly proportional to distance.

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