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  • At what distance from a long straight wire carrying current of 12A will the magnetic field be equal to <img alt="3 \times 10^{-5} \mathrm{wb} / \mathrm{m}^2" src="https://entrancecorner.oncode

At what distance from a long straight wire carrying current of 12A will the magnetic field be equal to 3 \times 10^{-5} \mathrm{wb} / \mathrm{m}^2

Option: 1

8 \times 10^{-2} \mathrm{~m}


Option: 2

12 \times 10^{-2} \mathrm{~m}


Option: 3

18 \times 10^{-2} \mathrm{~m}


Option: 4

24 \times 10^{-2} \mathrm{~m}


Answers (1)

best_answer

Current I =12A  and magnetic field (B)=3 \times 10^{-5} \mathrm{wb} / \mathrm{m}^2 \text {. }

consider magnetic filed \vec{B} at distance n

Magnetic field,

\begin{aligned} & B=\frac{\mu_0 I}{2 \pi n} \\ & n=\frac{\mu_0 I}{2 \pi B}=\frac{4 \pi \times 10^{-7} \times 12}{0 \times \pi \times\left(3 \times 10^{-5}\right)}=8 \times 10^{-2} \mathrm{~m} \end{aligned}

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Gunjita

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