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(D) . The Duddell's thermo-galvanometer is an instrument used for measuring small electric currents. It is suitable for circuits of any frequency (eve

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$A$ is false but $B$ is true.

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(D) . The Duddell's thermo-galvanometer is an instrument used for measuring small electric currents. It is suitable for circuits of any frequency (even up to $120,000 \, Hz$) and can measure currents as small as $20 \, \mu A$. It is equally effective for both direct current $(DC)$ and alternating current $(AC)$. Therefore,statement $A$ is false.$B$. $A$ thermopile is a device consisting of several thermocouples connected in series,used to measure small amounts of radiant heat. It is highly sensitive and can detect temperature differences of the order of $10^{-3} \, ^\circ C$. Therefore,statement $B$ is true.Conclusion: Statement $A$ is false,and statement $B$ is true.

Consider the following two statements $A$ and $B$ and identify the correct choice given in the answers.
$A$. Duddell's thermo-galvanometer is suitable to measure direct current only.
$B$. Thermopile can measure temperature differences of the order of $10^{-3} \, ^\circ C$.

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Consider the following two statements $A$ and $B$ and identify the correct choice given in the answers.$A$. Duddell's thermo-galvanometer is suitable to measure direct current only.$B$. Thermopile can measure temperature differences of the order of $10^{-3} \, ^\circ C$.