Electric Field Quiz

What is the formula to calculate the electric field due to a point charge?

• E = k * (q/r^2) * r-hat

• E = k * (q/r^2) * k-hat

• E = k * (q/r^2) * i-hat

• E = k * (q/r^2) * j-hat

If a positive test charge is placed in an electric field, in which direction does it experience a force?

• In a random direction

• In the opposite direction of the electric field lines

• In the direction of the electric field lines

• In the direction of the magnetic field lines

What is the SI unit of electric field?

• V/A

• C/kg

• J/C

• N/C

If the distance from a point charge is doubled, how does the electric field strength change?

• Decreases by a factor of 2

• Increases by a factor of 2

• Remains the same

• Decreases by a factor of 4

How does the electric field due to a positive point charge compare to the electric field due to a negative point charge at the same distance?

• They cancel each other out

• They are in opposite directions

• The negative charge has a stronger field

• They are in the same direction

What is the direction of the electric field at a point in space due to a positive point charge?

• Inward towards the charge

• Parallel to the charge

• No direction

• Outward from the charge

If two point charges are placed close to each other, how does the electric field at a point between them compare to the electric field at a point far away from them?

• Opposite direction

• No change

• Weaker

• Stronger

What is the electric field at a point located 2 meters away from a point charge of 5 C?

• E = (8.9875 x 10^9 N m^2/C^2) * (2 C / (5 m)^2)

• E = (8.9875 x 10^9 N m^2/C^2) * (5 C / (2 m)^3)

• E = (8.9875 x 10^9 N m^2/C^2) * (5 C / (2 m))

• E = (8.9875 x 10^9 N m^2/C^2) * (5 C / (2 m)^2)

How does the magnitude of the electric field due to a point charge change with an increase in the magnitude of the charge?

• Becomes negative

• Decreases

• Remains constant

• Increases

What is the direction of the electric field at a point in space due to a negative point charge?

• Parallel to the negative point charge

• Away from the negative point charge

• Perpendicular to the negative point charge

• Towards the negative point charge