Questions
The coercivity of a bar magnet is 120 A/m. It is to be demagnetised by placing it inside a solenoid of length 120 cm and number of tums 72. The current flowing through the solenoid is
detailed solution
Correct option is C
See fig. . In figure OC, represents the coercivity.OC = H = ni where n is number of turns per unit length. Here,n=72120×100=60and H = 120A/m∴i=Hn=12060=2ATalk to our academic expert!
Similar Questions
A solenoid of 1 . 5 metre length and 4 .0 cm diameter possesses 10 turns per cm. A current of 5 ampere is flowing through it. The magnetic field at axis inside the solenoid is (Given: weber/amp metre)
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