Answers OK-Physical Science BLab: Magnetic and Electric Fields

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Georgia moves an unattached piece of wire back and forth over a magnet. Which best explains what will happen?

A current will be induced because the wire moves through a magnetic field.

A current will not be induced because the wire moves through a magnetic field.

A current will be induced because the wire is not part of a closed circuit.

A current will not be induced because the wire is not part of a closed circuit.

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How are the magnetic field lines near the south pole of a magnet affected when a second south pole is brought near it?

The field lines combine with the lines around the second south pole.

The field lines overlap with the lines from the second south pole.

The field lines bend toward the second south pole.

The field lines bend away from the second south pole.

How are the current and resistance related when the voltage of a circuit is constant?

The current doubles when the resistance doubles because they are directly proportional.

The current doubles when the resistance doubles because they are inversely proportional.

The current is cut in half when the resistance doubles because they are directly proportional.

The current is cut in half when the resistance doubles because they are inversely proportional.

Which will a positively charged object attract?

an object that has a negative charge

an object that has a smaller positive charge

an object that has no charge

an object that has a larger positive charge

What is the resistance of a clock if it has a current of 0.30 A and runs on a 9.0-V battery?

0.033

2.7

9.3

The diagram shows a coiled wire that carries an electrical current.

the magnetic field

thermal energy

light energy

the electric field

Tisa makes a diagram to organize her notes about charging objects.

Electrons move between objects.

The objects do not touch.

The objects develop opposite charges.

The objects have the same charge.

Which device manages the flow of current in an electric circuit?

the wire

the switch

the battery

the light bulb

Mateo makes a table of the symbols that represent the parts of an electric circuit.

Uses electrical energy

Provides electrical energy

Measures electric current

Controls electric current

Potential difference is measured in which units?

volts

amps

currents

watts

Cora, an electrician, wraps a copper wire with a thick plastic coating. What is she most likely trying to do?

keep the electric potential of the wire balanced

decrease the wire’s resistance

increase the voltage produced by the wire

keep a current from passing out of the wire

A bar magnet is cut in half, as shown. Which shows the pieces after the magnet is cut?

2 pieces of broken magnet with a jagged edge on the inside side of each piece. On the left a piece labeled N S from left and on the right a piece labeled N S from left.

2 pieces of broken magnet with a jagged edge on the inside side of each piece. On the left a piece labeled N S from left and on the right a piece labeled S N from left.

2 pieces of broken magnet with a jagged edge on the inside side of each piece. On the left a piece labeled N and on the right a piece labeled S.

2 pieces of broken magnet with a jagged edge on the inside side of each piece. On the left a piece labeled S and on the right a piece labeled N.

An object that is made of which material is likely to be attracted to a magnet?

nitrogen

nickel

paper

plastic

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