Unit 3 Study Guide

A student claims the magnetic fields are not the same across the magnet. Using the picture, what evidence best supports the claim?

• The magnetic field is the strongest at the poles.

• The magnetic field is the strongest at the north.

• The magnetic field is the strongest in the middle

• The magnetic field is the strongest at the south.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

A student wraps a current carrying wire around an iron rod. She places the north pole of a bar magnet near the top of the rod. The magnet moves away from the rod. The student claims that a field exists between the rod and the magnet. Which argument best supports her claim?

• The current in the wire has created a gravitational field with its south pole at the top.

• The current in the wire has created a gravitational field with its north pole at the top.

• The current in the wire has created a magnetic field with its south pole at the top of the rod.

• The current in the wire has created a magnetic field with its north pole at the top of the rod.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Which diagram shows the greatest gravitational attraction?

• Two 5 kg balls close together

• Two 10 kg balls close together

• Two 5 kg balls far apart

• Two 10 kg balls far apart

Tags

NGSS.MS-PS2-4

What will most likely happen to the electrons when the rod touches the foam cup?

• The electrons will pass from the foam cup to the aluminum can and both the cup and the can will become positively charged.

• The electrons will pass to the foam cup and stay localized, negatively charged area where the rod was placed.

• The electrons will pass to the foam cup and stay localized, positively charged area where the rod was placed.

• The electrons will pass from the foam cup to the aluminum can and both the cup and the can will become negatively charged.

Tags

NGSS.MS-PS2-3

Select all the items that a glass rod would attract if it was rubbed with a silk cloth, giving it a positive charge.

• Balloon 1

• Plastic Sheet 1

• Balloon 2

• Plastic Sheet 2

• Balloon 2 and Plastic Sheet 1

Tags

NGSS.MS-PS2-3

Which statement best predicts what will happen to the charge and why?

• It will remain at the point of contact between the rod and the sphere, because resistance in the metal keeps the charges from moving.

• It will quickly spread to the air around the sphere, because it will seek to occupy as much volume of neutral matter as possible.

• It will distribute itself evenly over the sphere because like charges repel and the sphere is a conductor.

• It will slowly drift to the bottom of the sphere, because the charges rapidly attach to atoms making them slightly heavier than the surrounding atoms.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Maya plans a demonstration showing objects being charged by friction. What must she be sure to do when performing the demonstration?

• Use metal like aluminum and rub with another metal to transfer charge

• use an insulator and rub it with hair or fur to transfer charge

• Touch the a metal sphere with a charged rod

• Move two metal spheres so they touch each other.

Paper clip Y is not attracted to the magnet. What should you do and why?

• Unwrap the copper wire a couple of times

• Use a battery with less energy

• Move the magnet closer to the Paper Clip Y

• Use a smaller core

Tags

NGSS.MS-PS2-5

A student observes that at 20 cm no force required, 10 cm a small amount of force required easy to hold in place, and at 5 cm a large of force required hard to hold in place. What do the student's observations demonstrate?

• The EM field is stronger because the magnet is gradually getting stronger as the magnet is moved closer to the EM.

• The EM magnetic field becomes stronger as more wire turns are being added to the core.

• The EM magnetic field becomes stronger because the battery is adding more energy.

• The EM magnetic field becomes stronger as more magnetic material is added to it.

Tags

NGSS.MS-PS2-3

Battery Voltage Paperclips

3.0 3

4.5 6

6.0 9

7.5 13

Which question can be answered using this data?

• How does the voltage change when you change the number of wire wraps?

• How does the voltage change when the number of paperclips changes?

• How does the strength of EM change when the number of paperclips changes?

• How does the strength of an EM change when the voltage of the power source changes?