A. it has good residual magnetism
B. its hysteresis loop has large area
C. its mechanical strength is high
D. its mechanical strength is low
0
Those materials are well suited for making permanent magnets which have ________ retentivity and _________ coercivity
0
Conductivity is analogous to____________?
A. low, high
B. high, high
C. high, low
D. low, low
0
When both the inductance and resistance of a coil are doubled the value of________________?
A. retentivity
B. resistivity
C. permeability
D. inductance
0
Energy stored by a coil is doubled when its current is increased by percent___________?
A. time constant remains unchanged
B. initial rate of rise of current is doubled
C. final steady current is doubled
D. time constant is halved
0
Relative permeability of vacuum is__________?
A. 25
B. 50
C. 41.4
D. 100
0
Permeability in a magnetic circuit corresponds to________ in an electric circuit
A. 1
B. 1 H/m
C. 1/4JI
D. 4n x 10-‘ H/m
0
The relative permeability of a ferromagnetic material is_____________?
A. resistance
B. resistivity
C. conductivity
D. conductance
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