A. NI/1c
B. F_m
C. Φ = BAc Ac=area in m
D. None

A. Parallel Magnetic Circuit
B. Series Magnetic Circuit
C. Both a and b
D. None of them

A. Φ = f/r
B. Φ = t/p
C. 1/4p
D. None of them

A. its mechanical strength is high
B. its mechanical strength is low
C. its hysteresis loop has large area
D.  it has good residual magnetism

A. more than 100 or 1000
B. more than 10
C. less than one
D. more than one

A. cast iron 
B. wrought iron
C. alnico alloys
D. aluminium 

A. resistivity 
B. conductance 
C. resistance 
D. conductivity

A. ampere-turn/weber
B. ampere/metre
C. henry 
D. weber

A. final steady current is doubled
B. time constant is halved
C. time constant remains unchanged
D. initial rate of rise of current is doubled

A. low hysteresis loss
B. high coercivity
C. low coercivity
D. low retentivity