Magnets and Magnetic Fields
Physics · 50 practice questions
Natural and artificial magnets; magnetic properties of soft iron and steel; methods of making and demagnetizing magnets; magnetic field concept — of a permanent magnet, around a straight current-carrying conductor, circular wire and solenoid; earth's magnetic field (poles, magnetic meridian, angle of dip and declination); flux and flux density; applications in navigation and mineral exploration.
- Differentiate between the magnetic properties of soft iron and steel and identify methods of making/demagnetizing magnets.
- Determine the flux pattern of current-carrying conductors, circular wires, solenoids and the earth's magnetic field.
- Identify the magnetic elements of the earth's field and examine its applications in navigation and mineral exploration.
Try a few questions
- Practice question 1
The angle of dip is greatest, approaching 90°, mainly near the
- A.earth's magnetic equator
- B.earth's magnetic poles
- C.earth's geographic equator only, regardless of magnetic considerations
- D.international date line
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B. earth's magnetic poles
The earth's field points almost straight down (or up) near the magnetic poles, giving the largest possible dip angle there.
- Practice question 2
The magnetic field pattern around two like poles placed near each other shows field lines that repel and curve away from one another, with
- A.a neutral point between them where the fields exactly cancel
- B.no defined field pattern at all between the two poles
- C.field lines that pass directly and uninterrupted from one pole to the other
- D.a region of infinitely strong magnetic field exactly between them
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A. a neutral point between them where the fields exactly cancel
Between two like poles, the opposing field contributions exactly cancel at a specific neutral point along the line joining them.
- Practice question 3
A magnetic field is best described as
- A.a region completely free of any magnetic influence
- B.a property found only in electric currents, never in permanent magnets
- C.a measure of the exact temperature of a magnet
- D.a region around a magnet where magnetic force can be detected
Show the answer
D. a region around a magnet where magnetic force can be detected
The magnetic field maps out the space in which a magnet's influence can actually be felt.
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