A rod with circular cross-section area 2 cm 2 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 4 
x10 -6 Wb. The relative permeability of the rod is (Given: Permeability of vacuum 
)
A
12.5
B
C
125
D
Text Solution
Verified by ExpertsThe correct answer is:
C
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