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WorksheetsMagnetism
Total questions: 13
Worksheet time: 32mins
Calculate the magnetic field at a point, P, 5 cm from a wire carrying a current of 20 A to the left.
80 mT into the page
0.0004 T into the page
80 mT out of the page
0.0004 T out of the page
What is the magnetic field at position X, 0.15 m below wire A and 0.1 m above wire B, given that wire A carries a current of 1.5A to the right and wire B carries 2.5 A to the right.
3.0 x 10-6 T into the page
3.0 x 10-6 T out of the page
7 x 10-6 T into the page
5.2 x 10-6 T out of the page
A 3.0 A current flows in a wire of length 15 cm in a magnetic field of strength 50 μT . Calculate the magnitude of the force on the wire if the wire makes an angle of 55° to the field.
3.2 N
2.25×10−5N
1,800 N
1.8×10−5N
A wire of length 50 cm and mass 10 g is suspended in a horizontal plane by a pair of flexible leads. The wire is in a magnetic field of magnitude 0.50 T, which is directed as shown. What current is needed to remove the tension in the supporting leads?
16 A to the right
4.0 A to the left
25 mA to the left
0.39 A to the right
Magnetic field vectors point
From North to South pole
From South to North Pole
Outwards from the magnet
Inwards to the magnet
What is the rule used to determine the direction of the force which acts on a current-carrying wire in a magnetic field?
Fleming's left hand rule
Coulomb's right hand rule
Lenz's rule
Faraday's rule
The magnetic flux is a measurement of the total magnetic field, or number of field lines, that passes through a given area, which
is represented by ϕ and has SI units of Tesla
is represented by μo and has SI units of Weber
is represented by B and has SI units of Tesla
is represented by ϕ and has SI units of Weber
The magnetic flux density is a measure of the strength of the magnetic field, or the number of magnetic field lines per unit area, which
is represented by ϕ and has SI units of Tesla
is represented by μo and has SI units of Weber
is represented by B and has SI units of Tesla
is represented by ϕ and has SI units of Weber
What causes magnetism?
the sun
moving neutrons
moving charges
friction
What happens to the magnetic field strength due to a current flowing in a wire as the distance r from the wire increases?
the field strength increases proportional to r
the field strength remains constant
the field strength varies inversely with r
the field strength varies inversely with r2
When using Ampere's Right-Hand Grip Rule (or the right corkscrew rule), with the fingers curved in the direction of the current flowing through a coil, the thumb represents the direction of _____.
North pole
South pole
current flow
force on the wire
How can you change the direction of the field in a solenoid?
Change the number of coils
Change the size of the current
Change the direction of the current
Use a soft iron core
