Physics 202 Test 1

The resistivity ρ is proportional to the resistance R of a wire.

T

While maintaining a constant voltage V, the current I increases when the cross-sectional area A of a wire expands.

T

While maintaining a constant voltage V, the current I increases when the resistivity ρ of a wire decreases.

T

resistors connected in______ must have the same voltage, whereas resistors connected in series must have the same ______ flowing through each one

parallel,current

U0 (mu knot) =

permeability of a vacuum (4pi x 10^-7)

The potential energy of a negative charge moved towards the negative plate will increase or decrease?

increase

Electric current flowing in a straight wire create magnetic fields that _______ around the wire.

Circle around.

Force on a Wire

F=BI(l)sintheta F=q(deltax/deltat)B

The resistance is inversely proportional to the length of the wire L.

False

F=qvBsin(theta)

Magnetic Force on Moving Charges

Current flowing in a loop creates a magnetic field ___________.

Through the loop

The resistance is inversely proportional to the cross-sectional area A of the wire.

True

While maintaining a constant voltage V, the current I decreases when the length L of a wire increases.

True

While maintaining a constant voltage V, the current I increases when the resistivity ρ of a wire decreases.

True

While maintaining a constant voltage V, the current I decreases when the resistivity ρ of a wire decreases.

True.

The kinetic energy of a negative charge moved towards the negative plate will increase or decrease?

decrease