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the intensity of the magnetic induction field at the centre of a single turn circular coil of radius 5 cm carrying current of 0.9 A is

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the intensity of the magnetic induction field at the centre of a single turn circular coil of radius 5 cm carrying current of 0.9 A is
A. `36pixx10^(-7)T`
B. `9pixx10^(-7) T`
C. `36pixx10^(-6)T`
D. `9pixx10^(-6) T`
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Correct Answer - a
The intensity of magnetic induction filled
`B=(mu_(0)i)/(2r) =(4pixx10^(-7)xx0.9)/(2xx5xx10^(-2))`
`B=36 pi xx10^(-7) T`
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