A fixed resistor and a diode are connected in series to a battery of electromotive force (e.m.f.) 6.0 V and negligible internal resistance. The graph shows the variation with potential difference (p.d.) V of the current I for the diode.
The current in the diode is 40 mA
What is the resistance of the fixed resistor?
1 )
30 Ω
120 Ω
3 )
150 Ω
4 )
180 Ω
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