AP Physics B: Electrostatics Formulas
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Answers 100% Verified (Latest Update
2025/2026 RATED A+
F = (k * Q₁* Q₂) / (r²) - CORRECT ANSWERS To find the force between two charges with a
predefined distance.
F = force
k = 9 * 10⁹ - coulomb's law constant
Q₁ & Q₂ = charges
r = distance between the charges
Unit = Newtons (N).
E = F / q - CORRECT ANSWERS To find the magnitude of an electric field.
E = electric field
F = force
q = 1.6 * 10⁻¹⁹ - test charge
Unit = Newton ÷ Coulombs (N/C)
E = (k * Q) / r² - CORRECT ANSWERS To find the magnitude of an electric field from point
charge.
E = electric field
Q = charge
, r = distance of the charge
k = 9 * 10⁹ - coulomb's law constant
Unit = Newton / Coulombs (N/C)
W = q * E * d - CORRECT ANSWERS Work required to move a test charge a certain charge a
certain distance.
W = work
q = 1.6 * 10⁻¹⁹ - test charge
E = electric field
d = distance
Unit = Jouls (J)
W = KE = PE - CORRECT ANSWERS W = work
KE = kinetic energy
PE = potential energy
Units = Jouls (J)
V = PE / q = (q * E * d) / q = w / q - CORRECT ANSWERS V = voltage
q = 1.6 * 10⁻¹⁹ - test charge
E = electric field
d = distance
W = work
Units = volts, Jouls / Coulombs (v, J/C)
V = Ed - CORRECT ANSWERS V = voltage
Exam With Questions and Answers All
Answers 100% Verified (Latest Update
2025/2026 RATED A+
F = (k * Q₁* Q₂) / (r²) - CORRECT ANSWERS To find the force between two charges with a
predefined distance.
F = force
k = 9 * 10⁹ - coulomb's law constant
Q₁ & Q₂ = charges
r = distance between the charges
Unit = Newtons (N).
E = F / q - CORRECT ANSWERS To find the magnitude of an electric field.
E = electric field
F = force
q = 1.6 * 10⁻¹⁹ - test charge
Unit = Newton ÷ Coulombs (N/C)
E = (k * Q) / r² - CORRECT ANSWERS To find the magnitude of an electric field from point
charge.
E = electric field
Q = charge
, r = distance of the charge
k = 9 * 10⁹ - coulomb's law constant
Unit = Newton / Coulombs (N/C)
W = q * E * d - CORRECT ANSWERS Work required to move a test charge a certain charge a
certain distance.
W = work
q = 1.6 * 10⁻¹⁹ - test charge
E = electric field
d = distance
Unit = Jouls (J)
W = KE = PE - CORRECT ANSWERS W = work
KE = kinetic energy
PE = potential energy
Units = Jouls (J)
V = PE / q = (q * E * d) / q = w / q - CORRECT ANSWERS V = voltage
q = 1.6 * 10⁻¹⁹ - test charge
E = electric field
d = distance
W = work
Units = volts, Jouls / Coulombs (v, J/C)
V = Ed - CORRECT ANSWERS V = voltage
