In the following figure,the diodes which are forward biased are:

  • A
    $(a), (b)$ and $(d)$
  • B
    $(c)$ only
  • C
    $(a)$ and $(c)$
  • D
    $(b)$ and $(d)$

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The diode used in the circuit shown in the figure has a constant voltage drop of $0.5\; V$ at all currents and a maximum power rating of $100\; mW$. What should be the value of the resistor $R$,connected in series with the diode,to obtain the maximum current? (in $\Omega$)

The circuit has two oppositely connected ideal diodes in parallel. What is the current flowing in the circuit (in $A$)?

$A$ $P-N$ junction has a potential barrier of $0.5 \ V$. If an electron enters the $P-N$ junction diode from the $N$-side with a speed of $5 \times 10^5 \ m/s$,what will be its speed when it emerges from the $P$-side?

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In the given circuit,the current $(I)$ through the battery will be $..........\,A$.

Which of the following is correct with respect to the following statements? Due to diffusion of electrons from $n$ to $p$-side:
$I$. electrons are accumulated in the depletion region.
$II$. electron drift current is from $p$-side to $n$-side.
$III$. an ionised donor is left in the $n$-region.
$IV$. electrons of $n$-side come to $p$-side and electron-hole combination takes place in $p$-side.
Select the correct option from the following.

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