An iron rod of volume
Question:

An iron rod of volume $10^{-3} \mathrm{~m}^{3}$ and relative permeability 1000 is placed as core in a solenoid with 10 turns/cm. If a current of $0.5 \mathrm{~A}$ is passed through the solenoid, then the magnetic moment of the rod will be :

1. $0.5 \times 10^{2} \mathrm{Am}^{2}$

2. $50 \times 10^{2} \mathrm{Am}^{2}$

3. $500 \times 10^{2} \mathrm{Am}^{2}$

4. $5 \times 10^{2} \mathrm{Am}^{2}$

Correct Option: , 4

Solution: