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Question

# A solenoid has a core of a material with relative permeability 400. The winding of the .solenoid are insulated from the core and carry a current of 2A. If the number turns is 1000permeter, calculate the intensity of magnetization.

A
2×103A/m
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B
4×104A/m
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C
7.93×105A/m
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D
7.93×105A/m
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Solution

## The correct option is C 7.93×105A/mGiven: μr=400i=2An=1000per metreSolution : Intensity of magnetization is given as : I=Bμ0−HSo, H=n×i=1000×2=2000Am−1And, B=μni=μrμ0ni B=400×(4π×10−7)×1000×2 B=32π×10−2TSo, I=32π×10−24π×10−7−2000Am−1So, I=800000−2000=798000=7.98×105This is close to option C.So Correct opt:[C}

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