Paul sprinkles iron filings onto a piece of paper near a bar magnet. The iron filings quickly become arranged in a pattern all around the bar magnet. Which argument does this evidence BEST support?
Larger magnets can attract more objects.
b
A magnet can attract magnetic objects through various materials.
c
Only objects that are made of metal have a magnetic field.
d
Magnetic fields exist between objects that are not in contact with each other.
d. Magnetic fields exist between objects that are not in contact with each other.
Which statement best describes gravitational force?
a
Only objects with a large mass exert gravitational force on every other object.
b
Objects exert a gravitational force on every other object.
c
Objects exert a gravitational force only on objects close to them.
d
Only objects with a large mass exert gravitational force on objects close to them.
b. Objects exert a gravitational force on every other object.
A student is investigating the distribution of charges in insulators. The student will place an aluminum metal can on top of a foam cup and touch the side of the foam cup with a negatively charged rod. The set up for the investigation is shown in the diagram.
What will MOST LIKELY happen to the electrons when the rod touches the foam cup?
a
The electrons will pass from the foam cup to the aluminum can, and both the foam cup and the aluminum can will become positively charged.
b
The electrons will pass from the foam cup to the aluminum can, and both the foam cup and the aluminum can will become negatively charged.
c
The electrons will pass to the foam cup but will remain in a localized, positively charged area on the cup where the rod was placed.
d
The electrons will pass to the foam cup but will remain in a localized, negatively charged area on the cup where the rod was placed.
d. The electrons will pass to the foam cup but will remain in a localized, negatively charged area on the cup where the rod was placed.
Which of the following statements regarding electric insulators is correct?
a
Electric insulators are good heat conductors.
b
Charges within electric insulators do not readily move.
c
Electric charges move freely in electric insulators..
d
Electric insulators have high tensile strength.
b. Charges within electric insulators do not readily move.
When a plastic rod is rubbed with a wool cloth, the wool acquires a positive charge. What is the best explanation for this effect?
a
protons are transferred to the rod
b
protons are transferred to the cloth
c
electrons are transferred to the rod
d
electrons are transferred to the cloth