E&M Review 2022/2023

When a charged particle is moving along a linear path, it creates a magnetic field ______________.

• in a plane that is perpendicular to the path.

• in a plane that is parallel to the path

• that emanates in all three directions

• in the opposite direction

Conductivity measures

• the heat capacity of an object.

• the ability to reverse current flow.

• the ease of current flow through a material.

• how well a material can be stretched into a wire.

Temporary magnetization of some materials is achieved by

• heating the object to extreme temperatures.

• cooling the object to absolute zero.

• coiling the wire repeatedly.

• running a current through it.

How much current will you have in a circuit if you increase the amount of resistance - provided the voltage remains constant?

• More current

• Less current

• Same current

• Cross current

A circuit that has direct current has charges flowing in

• one direction

• two directions

• all directions

• no directions

A circuit that has alternating current has charges flowing in

• one direction

• two directions

• all directions

• no directions

What is the minimum number of charges required for the presence of electric potential energy?

• Just one

• At least two

• Three or more

• Zero - charges not required for EPE.

Why won't current flow if I simply connect two ends of a single piece of wire together?

• There must be voltage present to get current to flow.

• Only batteries can cause current to flow

• It is difficult to measure since current flows through wires at the speed of light.

• You are wrong - the current will flow.

Around a magnet, magnetic field lines form closed loops,

• originate at the north pole and terminate at the south pole

• originate at the south pole, and terminate on the north pole.

• originate at the north pole, and terminate on the south pole, but actually extend to infinity.

• originate at the south pole, and terminate on the north pole, but actually extend to infinity.

The picture best illustrates what device?

• magnet

• electromagnet

• series circuit

• parellel circuit