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An iron rod of volume 10–3 m3 and relative permeability 1000 is placed as core in a solenoid with 10 turns/cm. If a current of 0.5 A is passed through the solenoid, then the magnetic moment of the rod will be (1) 5 × 102 Am2 (2) 0.5 × 102 Am2 (3) 500 × 102 Am2 (4) 50 × 102 Am2 |
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Answer» The correct option is (1) 5 × 102 Am2 . M = φH Magnetic moment = MV H = ni |
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