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1)

A iron rod is placed parallel to the magnetic field of intensity 2000 Am-1. The magnetic flux through the rod is 6×104Wb and its cross-sectional area is 3 cm2 . The magnetic permeability  of the  rod in Wb A-1m-1 is 


A) 101

B) 102

C) 103

D) 104

Answer:

Option C

Explanation:

According to question  , magnetic

permeability of the rod is given by , μr=BB0

where, B= magnetic field without iron rod

B0 = magnetic field after insertion of iron  rod

so,  μr=B2000Am1

 (B.A=ϕB=ϕA=6×104Wb3×104m2=2Wbm2)

 So,   μr=22000=103