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Physics
UTME / JAMB 2022
Magnetic Field
Solution
Which expression gives magnetic flux?
A
qVB sin\(\theta\)
B
\(\frac{\mu \phi I}{2 \pi r}\)
C
BA cos \(\theta\)
D
-N \(\frac{d \phi}{dt}\)
medium Difficulty
Study Explanation
Physics
UTME / JAMB 2010
Magnetic Field
Diagram
Solution
In the diagram above, if the south-poles of two magnets strokes steel bar, the polarities at T and V will respectively be
A
south and north
B
north and south
C
north and north
D
south and south
medium Difficulty
Study Explanation
Physics
UTME / JAMB 2003
Magnetic Field
Solution
I It retains its magnetic much longer than steel.
II It is more easily magnetized than steel
III It is more easily demagnetized than steel
IV It produces a stronger magnet than steel
Which combination of the above makes iron preferable to steel in the making of electromagnets?
A
I and II only
B
II and III only
C
I, III, and IV only
D
II, III and IV only
medium Difficulty
Study Explanation
Physics
NECO SSCE 2001
Magnetic Field
Solution
Which material is best for making a permanent magnet?
A
aluminium
B
cobalt
C
copper
D
soft iron
E
steel
medium Difficulty
Study Explanation
Physics
WAEC / WASSCE 2000
Magnetic Field
Diagram
Solution
If a bar magnet is accidentally broken into three pieces as shown in the diagram above, the polarities of P and Q respectively, are
A
S and S
B
N and S
C
N and N
D
S and N
medium Difficulty
Study Explanation
Physics
UTME / JAMB 1980
Magnetic Field
Solution
The name given to the characteristics behavior of substances which set their length perpendicular to a strong magnetic field instead of in line with it is
A
magnetization
B
paramagnetism
C
diamagnetism
D
demagnetization
E
ferromagnetism
medium Difficulty
Study Explanation