U7.1 – Electric Fields

Electric Fields

1 / 13

Electric field originates at...

A positive charge

A negative charge

Either a positive or negative charge

Where there is zero charge

2 / 13

Coulomb's law states:

The closer the charges, the stronger the force between them.

The closer the charges, the weaker the force between them.

A point charge will always repel another point charge in a vacuum.

A point charge will always attract another point charge in a vacuum.

3 / 13

Calculate the force between a +3pC point charge and a +2.5pC point charge which are a distance of 3nm apart.

7.5x10³ N

7.5x10⁹ N

2.2x10¹⁰ N

2.2x10^-5 N

4 / 13

The force between two point charges has been calculated as -6.8x10⁴ Which of the following statement is correct?

The charges are alike and the force is repulsive.

The charges are opposite and the force is attractive.

The charges are opposite and the force is repulsive.

The charges are alike and the force is attractive.

5 / 13

Electric field strength...

Is a vector pointing in the direction a negative charge would move.

Is a vector pointing in the direction a positive charge would move.

Is a vector pointing in the direction a neutral charge would move.

Has no direction so cannot be a vector.

6 / 13

Which graph best represents the electric field strength of a radial field?

Graph A

Graph B

Graph C

Graph D

7 / 13

Calculate the electric field strength due to. point charge of 15.0 μm at a distance of 44 mm from the charge.

3.1x10⁶

3.0x10⁶

3.1x10³

3.0x10³

8 / 13

A uniform field can be produced by connecting...

Two adjacent plates to the same pole of a battery.

Two parallel plates to the same pole of a battery.

Two adjacent plates to opposite poles of a battery.

Two parallel plates to opposite poles of a battery.

9 / 13

Calculate potential difference of two plates that are 3 mm apart that are producing a field strength of 4x10⁵.

7500 V

12x10² V

1.2x10³ V

12x10^-2 V

10 / 13

In this equation, what does the "V" represent?

The electric potential energy that a unit positive charge would have at infinity.

The electric potential energy that a unit positive charge would have at a given point.

The electric potential energy that a unit negative charge would have at infinity.

The electric potential energy that a unit negative charge would have at a given point.

11 / 13

In the same equation, what is "Q" measured in?

C

NC^-1

Vm^-1

V

12 / 13

Equipotentials show...

All points of equal potential on a rugby field

All points of equal potential in a radial electric field

All points of equal potential in a uniform electric field

All point of equal potential in any electric field

13 / 13

A potential difference V is applied across two parallel plates. A particle exactly halfway between the two plates at point A experiences an electric force F. The electron moves to point B which is halfway between point A and the right-hand plate. Which of the following is the electric force experienced by the electron at Y? [image]

F

2F

F/4

F/2

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