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Solved problems for the chapter:

Magnetic Field Lines

View the theory »

Magnetic Field Density

1. Magnetic field density around a conductor and coil

1.1. Permeability of free space

2. Forum

↓ Show theory [1] ↓

Detailed solution steps are available at:

https://en.openprof.com/wb/chapter:magnetic_field_lines/3626/

Example 1.

The diagram below shows a magnet with some plotting compasses. The compasses show the direction of the magnetic field of the magnet. Which plotting compass has the needle pointing in the wrong direction?

Example 2.

The diagrams show two bar magnets that attract each other. Which diagram shows the magnetic field pattern between the poles?

Which diagram shows the pattern and direction of the magnetic field lines around a bar magnet?

A student uses three small plotting compasses to investigate the magnetic field around a bar magnet. Which diagram shows the directions in which the compass needles point?

Four plotting compasses are placed in the magnetic field of two identical bar magnets as shown in the diagram. Which compass is pointing in the wrong direction?

Which diagram shows the magnetic field around a bar magnet?

A small compass is placed close to a strong bar magnet, the same distance from each end. Which diagram shows the direction in which the compass needle points?

Which diagram shows the pattern and the direction of the magnetic field lines around a bar magnet?

The diagram shows a permanent bar magnet placed on a wooden table. A student draws arrows to show the direction of the magnetic field at four points. Which arrow shows the direction of the magnetic field at that position?

10.

The diagram shows the magnetic field around two bar magnets.

Which diagram shows the poles of the magnets?

11.

Which diagram shows the magnetic field around a bar magnet?

12.

Which diagram shows the pattern and direction of the magnetic field lines around a bar magnet?

13.

Which test could be used to find which end of a magnet is the north pole?

putting it near a non-ferrous metal
putting it near a steel spoon
putting it near a ferrous metal
putting it near a compass needle

14.

Four plotting compasses are placed near a bar magnet. Which plotting compass is shown pointing in the correct direction?

15.

The magnetic field of a bar magnet can be represented by magnetic field lines. Which diagram shows two magnetic field lines correctly?

16.

A student investigates which end of a magnetic compass needle is attracted to a bar magnet. What does the investigation show?

The compass needle is not attracted by either end of the magnet
Both ends of the compass needle are attracted by the south pole of the magnet
One end of the compass needle is attracted by the south pole of the magnet and the other end by the north pole of the magnet.
Both ends of the compass needle are attracted by the north pole of the magnet

17.

Point X is near to a bar magnet, as shown in the figure below.

Which arrow indicates the direction of the magnetic field of the bar magnet at point X?

18.

A brass rod is positioned in an east-west direction and a plotting compass is placed at both ends of the rod.

Which diagram shows the positions of the needles of the plotting compass at the ends?

19.

The diagram shows a bar magnet and four plotting compasses. Which compass shows the direction of the magnetic field due to the magnet?

20.

The figure below shows two bar magnets. What is the pattern and the direction of the magnetic field lines between the bar magnets?