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A long straight wire carries a current of 35 A. What is the magnitude of the field `vecB` at a point 20 cm from the wire?

Text Solution

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Here `l = 35 A ` and `R = 20 cm = 0.2 m`
`:. " " B = (mu_0 I)/(2 pi R) = (4 pi xx 10^(-7) xx 35)/(2 pi xx 0.2) = 3.5 xx 10^(-5)T`.
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