Question 104: Magnetism and Matter

Question

A long solenoid is formed by winding 70 turns cm$$^{-1}$$. If 2.0 A current flows, then the magnetic field produced inside the solenoid is ____________ ($$\mu_0=4\pi	imes10^{-7}$$ TmA$$^{-1}$$)

Accepted Answer

Number of turns per meter $=7000$ turns per $\mathrm{m}$
$$
\begin{aligned}
&i=2 \mathrm{~A} & \\
& B=\mu_{0} n i =4 \pi 	imes 10^{-7} 	imes 7000 	imes 2 \\
& =56 \pi 	imes 10^{-4} \mathrm{~T} \\
& =56 	imes \frac{22}{7} 	imes 10^{-4} \mathrm{~T} \\
& =176 	imes 10^{-4} \mathrm{~T}
\end{aligned}
$$

Answer

$$88	imes10^{-4}$$ T

Answer

$$1232	imes10^{-4}$$ T

Answer

$$176	imes10^{-4}$$ T

Answer

$$352	imes10^{-4}$$ T

Magnetism and Matter

A long solenoid is formed by winding 70 turns cm$^{-1}. If 2.0 A current flows, then the magnetic field produced inside the solenoid is ____________ (\mu_0=4\pi\times10^{-7} TmA^{-1}$)

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