By how much is the approximation B=μ0​nI [or in terms of Coulomb's constant ke​,B=c24πke​​nI] in error at the center of

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answerhappygod
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By how much is the approximation B=μ0​nI [or in terms of Coulomb's constant ke​,B=c24πke​​nI] in error at the center of

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By how much is the approximation B=μ0​nI [or in terms of Coulomb's constant ke​,B=c24πke​​nI] in error at the center of a solenoid that is 18 cm long, has a diameter of 6 cm, is wrapped with n turns per meter, and carries a current I? Compared to the exact expression, the approximation B=μ0​nI is by %
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