Q12. A galvanmeter has a coil of resistance $200 \Omega$ with a full scale deflection at $20 \mu \mathrm {~A}$. The value of resistance to be added to use it as an ammeter of range $( 0 - 20 ) \mathrm { mA }$ is ; (1) $0.40 \Omega$ (2) $0.20 \Omega$ (3) $0.50 \Omega$ (4) $0.10 \Omega$ Q13. [Figure] The equivalent resistance between A and B is : (1) $18 \Omega$ (2) $19 \Omega$ (3) $25 \Omega$ (4) $27 \Omega$
Q12. A galvanmeter has a coil of resistance $200 \Omega$ with a full scale deflection at $20 \mu \mathrm {~A}$. The value of resistance to be added to use it as an ammeter of range $( 0 - 20 ) \mathrm { mA }$ is ;\\
(1) $0.40 \Omega$\\
(2) $0.20 \Omega$\\
(3) $0.50 \Omega$\\
(4) $0.10 \Omega$
Q13.\\
\includegraphics[max width=\textwidth, alt={}, center]{4e2e81bd-4b90-4bb9-aa98-645235480371-02_359_456_1439_959}
The equivalent resistance between A and B is :\\
(1) $18 \Omega$\\
(2) $19 \Omega$\\
(3) $25 \Omega$\\
(4) $27 \Omega$