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)
detailed solution
Correct option is A
B=μ0ni where n = number of turns per unit length μ0=4π×10−7TA−1m n=10cm−1=1000m−1,i=5amp∴ B=4π×10−7(1000)(5)=2π×10−3TTalk to our academic expert!
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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
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