Q.

In the given figure, a diode D is connected to an external resistance R = 100 Ω and an e.m.f. of 3.5 V. If the barrier potential developed across the diode is 0.5 V, the current in the circuit will be

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a

20 mA

b

35 mA

c

30 mA

d

40 mA

answer is C.

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Detailed Solution

The potential difference across the resistance  R  is V=3.5 V-0.5 V=3 VBy Ohm's lawThe current in the circuit isI=VR=3 V100Ω=3×10-2 A=30×10-3 A=30 mA
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In the given figure, a diode D is connected to an external resistance R = 100 Ω and an e.m.f. of 3.5 V. If the barrier potential developed across the diode is 0.5 V, the current in the circuit will be