A student wants to demonstrate the size of a magnetic field to a friend. Which activity should the student perform
A
Suspend a magnet freely using a threes, and compare its alignment with a compass.
B
Cut a magnet in half and bring the hares together to show they attract each other.
С
Sprinke iron filings around the magnet, and observe the pattern in which the iron fillings arrange
themselves
Put an ron baarith a magnet and cring the bar close to the magnet to show that they attract each
D

C. Sprinkle iron filings around the magnet, and observe the pattern in which the iron fillings arrange  themselves.

Explanation:

In order to demonstrate the size of a magnetic field we can Sprinkle iron filings around the magnet, and observe the pattern in which the iron fillings arrange  themselves. This will help us know the directions of the magnetic field lines and their density , like magnetic field lines are coming out from the NORTH pole of the magnet and they will enter SOUTH pole and inside the magnet the magnetic field lines are aligned from SOUTH to NORTH.

We also observe that magnetic field line is most dense at poles and move farther as they are away from the poles.

answer: the primary difference between a hypothesis and a theory is that b hypothesis is falsifiable, but a theory has been proven to be correct. theory is an explanation of something that is happening but hypothesis is a guess of something that can happen

explanation:

since electrons are negative the answer is neagtaive