Question 286: Magnetism and Matter

Question

A straight wire carrying a current of $$14 \mathrm{~A}$$ is bent into a semi-circular arc of radius $$2.2 \mathrm{~cm}$$ as shown in the figure. The magnetic field produced by the current at the centre $$(\mathrm{O})$$ of the arc. is ____________ $$	imes ~10^{-4} \mathrm{~T}$$

Accepted Answer

$$
\begin{aligned}
& \mathrm{B}_{	ext {at } \mathrm{O}}=\frac{\mu_0 \mathrm{I}}{4 \mathrm{R}}=\frac{4 \pi 	imes 10^{-7} 	imes 14}{4 	imes 2.2 	imes 10^{-2}} \\
& =2 	imes 10^{-4} \mathrm{~T}
\end{aligned}
$$

Magnetism and Matter

A straight wire carrying a current of $14 \mathrm{~A} is bent into a semi-circular arc of radius 2.2 \mathrm{~cm} as shown in the figure. The magnetic field produced by the current at the centre (\mathrm{O}) of the arc. is ____________ \times ~10^{-4} \mathrm{~T}

Choose the correct answer: