A bar magnet has coercivity 4 10^3 Am^-1. It is placed inside a solenoid of 12 cm length and 60 turns. The current that should be passed through the solenoid to demagnetise the bar magnet is

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Correct answer: D. (d) Coercivity of bar magnet, H=4 10^3 Am Length of solenoid, L=12 cm=0.12 Number of turns, N=60 turns n= NL= 600.12= 500 turnm Current, i= Hn= 4 10^3500=8 A

$A bar magnet has coercivity 4 \times 10^{3} Am^{- 1} . It is placed inside a solenoid of 12 cm length and 60 turns. The current that should be passed through the solenoid to demagnetise the bar magnet is$

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