Question

Question 7 (1 point)
A student creates an electromagnet and holds it near two paper clips.



Paper clip Y is not attracted to the magnet. Which step should the student take to attract it?

a
The student should wrap the coil fewer times around the nail.
b
The student should use a smaller core in the magnet.
c
The student should use a battery with less energy.
d
The student should move the magnet closer to the paper clip.
Question 8 (1 point)
Mr. Chorma's science class built an electromagnet with a metal rod, a wire, and a battery. They day they built it, the electromagnet worked. The next day it did not work. What is the best explanation as to why the electromagnet did not work?

a
The wire wouldn't conduct electricity.
b
The battery was drained.
c
The battery wouldn't conduct electricity.
d
The circuit was closed.
Question 9 (1 point)
A student has five different-sized magnets. She puts each magnet far away from a paper clip and slowly moves the magnet closer until it attracts the paper clip. She records the distance between the magnet and the paper clip when it attracts. What is the student's experiment designed to test?

a
how the type of paper clip affects the way in which it reacts to the force of a magnet
b
how the size of a magnet affects the strength of its magnetic pull on objects
c
how the distance away from a magnet affects a paper clip's chances of being attracted
d
how the magnetic force of a magnet affects the movement of an object
Question 10 (1 point)
A student wishes to make the magnetic force exerted by the electromagnet shown below greater.

image e0200808b8fa436fae6f573f2546fa05

Which procedure step could the student follow to accomplish this goal?

a
reduce the number of wire turns at location 4
b
open the switch at location 2
c
increase the length of wire at location 1
d
add more batteries in series at location 3
Question 11 (1 point)
A student uses an electroscope to study the behavior of electrical forces. The electroscope is constructed as follows. When it is neutral, the lightweight foil leaves hang straight down, as shown below.

image 4fa1311b46334edaa4ab11921eec996e

The student performs a procedure on the electroscope, which transfers electrical charge to one or both of its leaves. After the procedure, the leaves hang apart as shown below.

image fbc2fedd27a444ad9c2c3c1c6185f981

If a greater charge had been transferred to the leaves, which behavior would they show?

a
They would angle inward to be close together or touching.
b
One would hang straight outward and one would hang straight down.
c
They would hang straight down again.
d
They would hang farther apart.

Answer 1

Q7: d — Move the magnet closer to the paper clip (magnetic force increases with decreased distance).

Q8: b — The battery was drained (no current → electromagnet stops working).

Q9: b — How the size of a magnet affects the strength of its magnetic pull on objects.

Q10: d — Add more batteries in series at location 3 (increases current and magnetic field strength).

Q11: d — They would hang farther apart (greater like charges → stronger repulsion).