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प्रश्न
Calculate the value of the magnetic field at a distance of 2 cm from a very long straight wire carrying a current 5 A?
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उत्तर
B = `(mu_0"I")/(2pi"R") (4pi xx 10^-7 xx 5)/(2pi xx 2 xx 10^-2) = 5 xx 10^-5`T
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