Quick practice
Question 1 of 5
A rod with circular cross-section area 
and
length 40 cm is wound uniformly with 400 turns of
an insulated wire. If a current of 0.4 A flows in the
wire windings, the total magnetic flux produced
inside windings is 
. The relative
permeability of the rod is
(Given : Permeability of vacuum 
)
A
B
C
12.5
D
125
Concepts
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