Physics (AS & A Level) · May / June 2022 · Paper 11 · Question 33
9702Resistance and resistivity
The graph shows the I–V characteristic for a semiconductor diode. Which statement can be deduced from the graph?
- AAbove a certain positive potential difference the diode obeys Ohm's law.
- BCurrent is directly proportional to potential difference when the current in the diode is in one direction.
- CThe diode has zero resistance when the current in the diode is in one direction.
- DThe resistance of the diode depends upon the potential difference across it.
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Correct answer: D. The resistance of the diode depends upon the potential difference across it.
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