An iron rod of volume 
and relative permeability 1000 is placed inside a long solenoid wound with 5 turns/ cm. If a current of 0.5 A is passed through the solenoid, then the magnetic moment of the rod is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
We have, 
For a solenoid of n-turns per unit length and current i,
Magnetic moment 
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