Electric Fields 3

What is the electric field strength 1mm away from an electron?

• 1.4 mN/C
• 1.4 μN/C
• 2.3 x 10^-16 N/C
• 2.3 x 10^-22 N/C

Find the force acting on a proton in an electric field with a field strength of 6kN/C

• 2.7 x 10^-23 N
• 2.7 x 10^-20 N
• 9.6 x 10^-19 N
• 9.6 x 10^-16 N

What is the electric field strength when an alpha particle in said field experiences a force of 1.5fN

• 9400 N/C
• 4700 N/C
• 3500 N/C
• 2200 N/C

• A
• B
• C
• D

• A
• B
• C
• D

The diagram shows four point charges, each +Q, at the corners of a square of side 2a. What is the electric field strength at P, the centre of the square?

• A
• B
• C
• D

• A
• B
• C
• D

We can treat a sphere has a point charge with the charge acting at the centre of the sphere if

• The charge on the sphere is focussed around the top and bottom of the sphere
• The charge on the sphere is focussed around a band running round the middle of the sphere
• The charge on the sphere is distributed uniformally
• The charge on the sphere is negligible

In the equation for electric field strength in radial fields, Q is

• The average of the charge creating the field and the charge in the field
• The charge creating the field
• The charge in the field
• The charge on an electron

The following is a graph of electric field strength vs distance for a

• Charged sphere
• Point charge
• Parallel plates