Physics Chapter 19/20 Review

Items are attracted the strongest to the “ends” of the magnets, also called their ______.

• poles

• bars

• inlets

Hans Christian Oersted demonstrated that electricity and magnetism were related.

• True

• False

The process of inducing a current in a circuit using a changing magnetic field is called electromagnetic ________.

• pulse

• generation

• induction

A coil with 25 turns of wire and a cross-sectional area of 1.8 m2 has a uniform magnetic field applied to it. If the field increases from 0.00 T to 0.55 T in 0.85 s, what is the magnitude of the induced current?

• -1.2V

• -29V

• -25V

Which example is showing a magnetized substance, left or right?

• Right

• Left

No matter how many times a permanent magnet is cut, each new piece will have a north and south.

• True

• False

What do magnetic compasses show when place around a wire that current is flowing through?

• The compasses point in random directions

• That a magnetic field is created around it

• All the compasses point at the wire

The direction the wire is moved through the magnetic field determines the direction the ______ will move.

• current

• charges

• electrons

• all the above

What is the induced current if a magnetic field produces an emf of 30 V and a resistance of 1.5 Ω?

• 20A

• 45A

• 4.5A

The blue lines represent?

• Magnetic field lines

• Electrical current

• Compass strength