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 $.......\times 10^{-4}\,T$ $\left(\mu_0=4 \pi \times 10^{-7}\,TmA ^{-1}\right)$
JEE MAIN 2023, Easy
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$B =\mu_0 nI$
$=4 \pi \times 10^{-7} \times 70 \times 10^2 \times 2$
$=56 \pi \times 10^{-4}\,T$
$=176 \times 10^{-4}\,T$
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