B

1103171502

Level: 
B
Current-Voltage characteristic of a conductor is a relationship, usually represented as a graph, between the current \( I \) through the conductor and the voltage \( U \) across the conductor. The picture shows two characteristics: of a metal conductor (red colour) and of an electrolytic conductor (black colour). At what voltages need to be conductors connected so that the current is the same in both of them?
\( 10\,\mathrm{V} \)
\( 16\,\mathrm{V} \)
\( 8\,\mathrm{V} \)
\( 9.5\,\mathrm{V} \)

1103129201

Level: 
B
The thin lens equation \( \frac1a+\frac1{a'}=\frac1f \) describes the quantitative relationship between the object distance \( a \), the image distance \( a' \), and the focal length \( f \). Let the focal length of a thin lens be \( 0{.}5\,\mathrm{m} \). Choose the picture that shows the object distance vs. image distance graph, if \( a\in [0.1\,\mathrm{m};0.4\,\mathrm{m}]\cup [0.6\,\mathrm{m};3.0\,\mathrm{m}] \).