Physics 1260 Exam study guide 2.0 with
Questions and 100% Correct Answers
The Superposition Principle - Answer The resultant (total) force on any one
charge equals the vector sum of the
forces exerted by all the other individual
charges that are present.
The direction of the E-field is - Answer the direction of the electric force that
would be exerted on a small positive
test charge placed at that point
E-field lines point - Answer Away from positive charges and toward
negative charges
From high potential (V) to low potential
, E-Field: Flux - Answer Gaussian surface "catches" E-field lines (like a wind-sock)
Open surface (like a net), use: - Answer = cos sigma
Closed surface around a total
charge, use: - Answer =4 n
Big insulator sheet (i.e. infinite plane) of charge, use: - Answer ∞ =2 sigma
E-Field: Conductors Properties: - Answer 1. E-Field inside material is always zero
2. Excess charge resides on surface
3. E-Field within empty cavity is zero
4. Perpendicular outside/near charged conductor
5. Sharp points hold more charge → stronger E-Field
Potential (V) - Answer Charges → E-Field → Potential (V) →
Energy Similar to Gravity
Electric potential - Answer scalar
Still use Superposition Principle
V = 0 - Answer defined to be infinitely far away
Equipotential lines/surfaces - Answer are perpendicular to E-Field lines
Potential energy - Answer converted to kinetic energy along E-Field, from high to low V
Questions and 100% Correct Answers
The Superposition Principle - Answer The resultant (total) force on any one
charge equals the vector sum of the
forces exerted by all the other individual
charges that are present.
The direction of the E-field is - Answer the direction of the electric force that
would be exerted on a small positive
test charge placed at that point
E-field lines point - Answer Away from positive charges and toward
negative charges
From high potential (V) to low potential
, E-Field: Flux - Answer Gaussian surface "catches" E-field lines (like a wind-sock)
Open surface (like a net), use: - Answer = cos sigma
Closed surface around a total
charge, use: - Answer =4 n
Big insulator sheet (i.e. infinite plane) of charge, use: - Answer ∞ =2 sigma
E-Field: Conductors Properties: - Answer 1. E-Field inside material is always zero
2. Excess charge resides on surface
3. E-Field within empty cavity is zero
4. Perpendicular outside/near charged conductor
5. Sharp points hold more charge → stronger E-Field
Potential (V) - Answer Charges → E-Field → Potential (V) →
Energy Similar to Gravity
Electric potential - Answer scalar
Still use Superposition Principle
V = 0 - Answer defined to be infinitely far away
Equipotential lines/surfaces - Answer are perpendicular to E-Field lines
Potential energy - Answer converted to kinetic energy along E-Field, from high to low V
