AP Physics C E&M Units 1-3 Conceptual

Which of the following Gaussian surfaces would be the simplest to use to determine the electric field intensity near a long, straight, charged wire?

A cylinder whose axis coincides with the wire.

Net Charge inside hollow area of a nonconducting shell

zero

A volt is a unit of

energy

A charge +Q is uniformly distributed throughout a nonconducting spherical shell of inner radius R₁ and outer radius R₂, as shown above. The electric field is determined at a distance r from the center of the spherical shell. The electric field for r > R₂ is:

The electric field of an isolated, uniformly charged metallic sphere is greatest ____________.

at the sphere’s outer surface

The capacitance of a parallel plate capacitor is _________.

proportional to the area of the plates

The electric field just outside of a conductor that is in electrostatic equilibrium _____________.

is perpendicular to the conductor’s surface

An electric field is the ______________.

force per unit charge

Switch S in the circuit shown above has been closed for a long time. Which of the following is the correct expression for the current in the resistor?

ε/R