Electric Field Concepts and Calculations

What is the unit of electric field strength?

• Coulombs per Newton

• Watts per Newton

• Newtons per Coulomb

• Joules per Coulomb

How does a positive test charge move in an electric field?

• It moves in the opposite direction of the electric field.

• It moves in the same direction as the electric field.

• It remains stationary.

• It moves randomly.

What is the formula for calculating the electric field created by a point charge?

• E = k * q / r^2

• E = q / (k * r^2)

• E = k * q / r

• E = r^2 / (k * q)

In a uniform electric field, what must be true for a charge to remain suspended?

• The electric force must be greater than the gravitational force.

• The charge must be negative.

• The electric force must be equal to the gravitational force.

• The electric force must be less than the gravitational force.

What is the direction of the electric field if an electron accelerates to the east?

• North

• South

• West

• East

What is the acceleration of an electron placed in an electric field of 2 x 10^4 N/C?

• 4.2 x 10^14 m/s²

• 3.517 x 10^15 m/s²

• 2.5 x 10^10 m/s²

• 1.6 x 10^12 m/s²

How is the net electric field calculated between two charges when they are equidistant from a point?

• By dividing the electric fields

• By adding the electric fields

• By multiplying the electric fields

• By subtracting the electric fields

What happens to the electric field if the charge magnitude doubles?

• It doubles

• It halves

• It remains the same

• It quadruples

If the distance between a charge and a point is doubled, what happens to the electric field?

• It remains the same

• It becomes one-fourth

• It doubles

• It becomes one-half

What is the effect on the electric field when the distance to a charge is reduced by a factor of three?

• It remains unchanged

• It decreases by a factor of three

• It increases by a factor of nine

• It decreases by a factor of nine