Question

the diagram above shows a bar magnet resting on top of a piece of white paper. the north and south poles of the magnet are labeled n and s. points a, b, c, and d represent four locations around the magnet.
question 3.
if iron filings were sprinkled evenly across the white paper circle, at which location would the greatest concentration of iron filings be found after 30 seconds?
a. a
b. b
c. c
d. d

Explanation:

In a bar magnet, the magnetic field is strongest at the poles (north - N and south - S). Location B is near the N pole of the magnet, and location D is near the S pole. But looking at the diagram, B is at the N pole side. Iron filings are attracted more strongly to the poles of a magnet. So among the locations, B (near the N pole) will have the greatest concentration of iron filings as the magnetic force is strongest at the poles, causing more iron filings to be attracted there.

Answer:

B. B