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A solenoid has $500$ turns per metre and carries $2$ A. Field inside is:
A$\mu_0\cdot 1000$ T, ignoring the formula factor here entirely
B$1.26\times 10^{-3}$ T, by $B = \mu_0 n I$ with values given
C$500$ T, the turns per metre alone in tesla units here always
DZero, since solenoid field is concentrated outside it instead
Answer & Solution
Correct answer: B. $1.26\times 10^{-3}$ T, by $B = \mu_0 n I$ with values given
$B = \mu_0 n I = 4\pi\times 10^{-7}\cdot 500\cdot 2 \approx 1.26\times 10^{-3}$ T.
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