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Q.

A cell of emf 4.5V is connected to a junction diode whose barrier potential is 0.7V. If the external resistance in the circuit is 190Ω , the current in the circuit is

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a

20 mA

b

2m A

c

23mA

d

200mA

answer is A.

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Detailed Solution

V=4.5- 0.7=3.8V ; R=190Ω,i=VR
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