Exercise: Magnetism And Electromagnetism

Questions for: Magnetism And Electromagnetism

The induced voltage across a stationary conductor in a stationary magnetic field is
A:
zero
B:
reversed in polarity
C:
increased
D:
decreased
Answer: A
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The voltage induced across a certain coil is 200 mV. A 120 resistor is connected to the coil terminals. The induced current is
A:
1.7 mA
B:
16 mA
C:
12 mA
D:
120 mA
Answer: A
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The ability of a material to remain magnetized after removal of the magnetizing force is known as
A:
permeability
B:
reluctance
C:
hysteresis
D:
retentivity
Answer: D
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When the north poles of two bar magnets are brought close together, there will be
A:
no force
B:
a downward force
C:
a force of attraction
D:
a force of repulsion
Answer: D
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The direction of a magnetic field within a magnet is
A:
from south to north
B:
from north to south
C:
back to front
D:
front to back
Answer: A
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