A bar magnet has coercivity of 4×103 A/m . It is desired to demagnetize it by inserting it inside a solenoid 12cm long having 60 turns. What current ( in A ) should be sent through the solenoid ?

see full answer

High-Paying Jobs That Even AI Can’t Replace — Through JEE/NEET

🎯 Hear from the experts why preparing for JEE/NEET today sets you up for future-proof, high-income careers tomorrow.

An Intiative by Sri Chaitanya

answer is 3.

(Unlock A.I Detailed Solution for FREE)

Detailed Solution

Given H=4×103 A/m N=60 Formula H=NiL ⇒i=HLN=4×103×0.1260=8A

Watch 3-min video & get full concept clarity