Question

A student claims that Earth has a magnetic field. Which evidence would best support the student's claim?

a
The student receives a shock after walking across the carpet and touching a doorknob.
b
The student creates a working circuit that illuminates a bulb using wire and a battery.
c
The student turns in all directions with a compass and the needle always points north.
d
The student rolls a ball down a large hill and the ball comes to a complete stop at the bottom.
Question 4 (1 point)
A student makes the claim that the space around a charged particle will exert a force on any other charged particle that is placed within this space. If an object is placed between two charged metal plates, one plate that is positively charged and one plate that is negatively charged, which argument best supports the student's claim?

a
An object with a positive charge will move toward the negative plate.
b
An object with a negative charge will remain stationary between the plates.
c
A neutrally-charged object will move toward the positive plate.
d
A neutrally-charged object will move toward the negative plate.

Answer 1

1st: c — A compass needle aligning toward north is evidence of Earth's magnetic field.

2nd: a — A positively charged object moving toward the negatively charged plate shows the electric force (field) acting through the space between the plates.